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http://rosettacode.org/wiki/Sorting_algorithms/Selection_sort
Sorting algorithms/Selection sort
Sorting Algorithm This is a sorting algorithm.   It may be applied to a set of data in order to sort it.     For comparing various sorts, see compare sorts.   For other sorting algorithms,   see sorting algorithms,   or: O(n logn) sorts Heap sort | Merge sort | Patience sort | Quick sort O(n log2n) sorts Shell Sort ...
#Euphoria
Euphoria
function selection_sort(sequence s) object tmp integer m for i = 1 to length(s) do m = i for j = i+1 to length(s) do if compare(s[j],s[m]) < 0 then m = j end if end for tmp = s[i] s[i] = s[m] s[m] = tmp end for r...
http://rosettacode.org/wiki/Soundex
Soundex
Soundex is an algorithm for creating indices for words based on their pronunciation. Task The goal is for homophones to be encoded to the same representation so that they can be matched despite minor differences in spelling   (from the   soundex   Wikipedia article). Caution There is a major issue in many of the ...
#FutureBasic
FutureBasic
include "NSLog.incl"   local fn SoundexCode( charCode as unsigned char ) as unsigned char select charCode case _"B", _"F", _"P", _"V" charCode = _"1" case _"C", _"G", _"J", _"K", _"Q", _"S", _"X", _"Z" charCode = _"2" case _"D", _"T" charCode = _"3" case _"L" charCode = _"4" ...
http://rosettacode.org/wiki/Sorting_algorithms/Shell_sort
Sorting algorithms/Shell sort
Sorting Algorithm This is a sorting algorithm.   It may be applied to a set of data in order to sort it.     For comparing various sorts, see compare sorts.   For other sorting algorithms,   see sorting algorithms,   or: O(n logn) sorts Heap sort | Merge sort | Patience sort | Quick sort O(n log2n) sorts Shell Sort ...
#Lisaac
Lisaac
Section Header   + name := SHELL_SORT;   - external := `#include <time.h>`;   Section Public   - main <- ( + a : ARRAY[INTEGER];   a := ARRAY[INTEGER].create 0 to 100; `srand(time(NULL))`; 0.to 100 do { i : INTEGER; a.put `rand()`:INTEGER to i; };   shell a;   a.foreach { item : INTEGER; item.prin...
http://rosettacode.org/wiki/Sorting_algorithms/Shell_sort
Sorting algorithms/Shell sort
Sorting Algorithm This is a sorting algorithm.   It may be applied to a set of data in order to sort it.     For comparing various sorts, see compare sorts.   For other sorting algorithms,   see sorting algorithms,   or: O(n logn) sorts Heap sort | Merge sort | Patience sort | Quick sort O(n log2n) sorts Shell Sort ...
#Lua
Lua
function shellsort( a ) local inc = math.ceil( #a / 2 ) while inc > 0 do for i = inc, #a do local tmp = a[i] local j = i while j > inc and a[j-inc] > tmp do a[j] = a[j-inc] j = j - inc end a[j] = tmp end ...
http://rosettacode.org/wiki/Stable_marriage_problem
Stable marriage problem
Solve the Stable marriage problem using the Gale/Shapley algorithm. Problem description Given an equal number of men and women to be paired for marriage, each man ranks all the women in order of his preference and each woman ranks all the men in order of her preference. A stable set of engagements for marriage is o...
#XSLT_2.0
XSLT 2.0
<xsl:stylesheet version="2.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform" xmlns:fn="http://www.w3.org/2005/xpath-functions" xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:m="http://rosettacode.org/wiki/Stable_marriage_problem" xmlns:t="http://rosettacode.org/wiki/Stable_marriage_problem/temp" ex...
http://rosettacode.org/wiki/Stack
Stack
Data Structure This illustrates a data structure, a means of storing data within a program. You may see other such structures in the Data Structures category. A stack is a container of elements with   last in, first out   access policy.   Sometimes it also called LIFO. The stack is accessed through its top. The ba...
#Lua
Lua
stack = {} table.insert(stack,3) print(table.remove(stack)) --> 3
http://rosettacode.org/wiki/Spiral_matrix
Spiral matrix
Task Produce a spiral array. A   spiral array   is a square arrangement of the first   N2   natural numbers,   where the numbers increase sequentially as you go around the edges of the array spiraling inwards. For example, given   5,   produce this array: 0 1 2 3 4 15 16 17 18 5 14 23 24 19 6 13 22 21 ...
#Nim
Nim
import sequtils, strutils   proc `$`(m: seq[seq[int]]): string = for r in m: let lg = result.len for c in r: result.addSep(" ", lg) result.add align($c, 2) result.add '\n'   proc spiral(n: Positive): seq[seq[int]] = result = newSeqWith(n, repeat(-1, n)) var dx = 1 var dy, x, y = 0 for ...
http://rosettacode.org/wiki/Sorting_algorithms/Radix_sort
Sorting algorithms/Radix sort
Sorting Algorithm This is a sorting algorithm.   It may be applied to a set of data in order to sort it.     For comparing various sorts, see compare sorts.   For other sorting algorithms,   see sorting algorithms,   or: O(n logn) sorts Heap sort | Merge sort | Patience sort | Quick sort O(n log2n) sorts Shell Sort ...
#Perl
Perl
#!/usr/bin/perl use warnings; use strict;   sub radix { my @tab = ([@_]);   my $max_length = 0; length > $max_length and $max_length = length for @_; $_ = sprintf "%0${max_length}d", $_ for @{ $tab[0] }; # Add zeros.   for my $pos (reverse -$max_length .. -1) { my @newtab; for my $bu...
http://rosettacode.org/wiki/Sorting_algorithms/Quicksort
Sorting algorithms/Quicksort
Sorting Algorithm This is a sorting algorithm.   It may be applied to a set of data in order to sort it.     For comparing various sorts, see compare sorts.   For other sorting algorithms,   see sorting algorithms,   or: O(n logn) sorts Heap sort | Merge sort | Patience sort | Quick sort O(n log2n) sorts Shell Sort ...
#AWK
AWK
  # the following qsort implementation extracted from: # # ftp://ftp.armory.com/pub/lib/awk/qsort # # Copyleft GPLv2 John DuBois # # @(#) qsort 1.2.1 2005-10-21 # 1990 john h. dubois iii (john@armory.com) # # qsortArbIndByValue(): Sort an array according to the values of its elements. # # Input variables: # # Arr...
http://rosettacode.org/wiki/Sorting_algorithms/Patience_sort
Sorting algorithms/Patience sort
Sorting Algorithm This is a sorting algorithm.   It may be applied to a set of data in order to sort it.     For comparing various sorts, see compare sorts.   For other sorting algorithms,   see sorting algorithms,   or: O(n logn) sorts Heap sort | Merge sort | Patience sort | Quick sort O(n log2n) sorts Shell Sort ...
#jq
jq
def patienceSort: length as $size | if $size < 2 then . else reduce .[] as $e ( {piles: []}; .outer = false | first( range(0; .piles|length) as $ipile | if .piles[$ipile][-1] < $e then .piles[$ipile] += [$e] | .outer = true else empty ...
http://rosettacode.org/wiki/Sorting_algorithms/Insertion_sort
Sorting algorithms/Insertion sort
Sorting Algorithm This is a sorting algorithm.   It may be applied to a set of data in order to sort it.     For comparing various sorts, see compare sorts.   For other sorting algorithms,   see sorting algorithms,   or: O(n logn) sorts Heap sort | Merge sort | Patience sort | Quick sort O(n log2n) sorts Shell Sort ...
#ARM_Assembly
ARM Assembly
  /* ARM assembly Raspberry PI */ /* program insertionSort.s */ /* look Pseudocode begin this task */   /************************************/ /* Constantes */ /************************************/ .equ STDOUT, 1 @ Linux output console .equ EXIT, 1 @ Linux syscall .equ WRITE, 4 ...
http://rosettacode.org/wiki/Sorting_algorithms/Permutation_sort
Sorting algorithms/Permutation sort
Sorting Algorithm This is a sorting algorithm.   It may be applied to a set of data in order to sort it.     For comparing various sorts, see compare sorts.   For other sorting algorithms,   see sorting algorithms,   or: O(n logn) sorts Heap sort | Merge sort | Patience sort | Quick sort O(n log2n) sorts Shell Sort ...
#PicoLisp
PicoLisp
(de permutationSort (Lst) (let L Lst (recur (L) # Permute (if (cdr L) (do (length L) (T (recurse (cdr L)) Lst) (rot L) NIL ) (apply <= Lst) ) ) ) )
http://rosettacode.org/wiki/Sorting_algorithms/Permutation_sort
Sorting algorithms/Permutation sort
Sorting Algorithm This is a sorting algorithm.   It may be applied to a set of data in order to sort it.     For comparing various sorts, see compare sorts.   For other sorting algorithms,   see sorting algorithms,   or: O(n logn) sorts Heap sort | Merge sort | Patience sort | Quick sort O(n log2n) sorts Shell Sort ...
#PowerShell
PowerShell
Function PermutationSort( [Object[]] $indata, $index = 0, $k = 0 ) { $data = $indata.Clone() $datal = $data.length - 1 if( $datal -gt 0 ) { for( $j = $index; $j -lt $datal; $j++ ) { $sorted = ( PermutationSort $data ( $index + 1 ) $j )[0] if( -not $sorted ) { $temp = $data[ $index ] $data[ $inde...
http://rosettacode.org/wiki/Sorting_algorithms/Heapsort
Sorting algorithms/Heapsort
Sorting Algorithm This is a sorting algorithm.   It may be applied to a set of data in order to sort it.     For comparing various sorts, see compare sorts.   For other sorting algorithms,   see sorting algorithms,   or: O(n logn) sorts Heap sort | Merge sort | Patience sort | Quick sort O(n log2n) sorts Shell Sort ...
#11l
11l
F siftdown(&lst, start, end) V root = start L V child = root * 2 + 1 I child > end L.break I child + 1 <= end & lst[child] < lst[child + 1] child++ I lst[root] < lst[child] swap(&lst[root], &lst[child]) root = child E L.break   F heapsort(...
http://rosettacode.org/wiki/Sorting_algorithms/Merge_sort
Sorting algorithms/Merge sort
Sorting Algorithm This is a sorting algorithm.   It may be applied to a set of data in order to sort it.     For comparing various sorts, see compare sorts.   For other sorting algorithms,   see sorting algorithms,   or: O(n logn) sorts Heap sort | Merge sort | Patience sort | Quick sort O(n log2n) sorts Shell Sort ...
#360_Assembly
360 Assembly
* Merge sort 19/06/2016 MAIN CSECT STM R14,R12,12(R13) save caller's registers LR R12,R15 set R12 as base register USING MAIN,R12 notify assembler LA R11,SAVEXA get the address of my savearea ST R13,4(R11...
http://rosettacode.org/wiki/Sorting_algorithms/Pancake_sort
Sorting algorithms/Pancake sort
Sorting Algorithm This is a sorting algorithm.   It may be applied to a set of data in order to sort it.     For comparing various sorts, see compare sorts.   For other sorting algorithms,   see sorting algorithms,   or: O(n logn) sorts Heap sort | Merge sort | Patience sort | Quick sort O(n log2n) sorts Shell Sort ...
#Go
Go
package main   import "fmt"   func main() { list := pancake{31, 41, 59, 26, 53, 58, 97, 93, 23, 84} fmt.Println("unsorted:", list)   list.sort() fmt.Println("sorted! ", list) }   type pancake []int   func (a pancake) sort() { for uns := len(a) - 1; uns > 0; uns-- { // find largest in unsort...
http://rosettacode.org/wiki/Sorting_algorithms/Stooge_sort
Sorting algorithms/Stooge sort
Sorting Algorithm This is a sorting algorithm.   It may be applied to a set of data in order to sort it.     For comparing various sorts, see compare sorts.   For other sorting algorithms,   see sorting algorithms,   or: O(n logn) sorts Heap sort | Merge sort | Patience sort | Quick sort O(n log2n) sorts Shell Sort ...
#Oz
Oz
declare proc {StoogeSort Arr} proc {Swap I J} Tmp = Arr.I in Arr.I := Arr.J Arr.J := Tmp end   proc {Sort I J} Size = J-I+1 in if Arr.J < Arr.I then {Swap I J} end if Size >= 3 then Third = Size div 3 in ...
http://rosettacode.org/wiki/Sorting_algorithms/Sleep_sort
Sorting algorithms/Sleep sort
Sorting Algorithm This is a sorting algorithm.   It may be applied to a set of data in order to sort it.     For comparing various sorts, see compare sorts.   For other sorting algorithms,   see sorting algorithms,   or: O(n logn) sorts Heap sort | Merge sort | Patience sort | Quick sort O(n log2n) sorts Shell Sort ...
#UNIX_Shell
UNIX Shell
f() { sleep "$1" echo "$1" } while [ -n "$1" ] do f "$1" & shift done wait
http://rosettacode.org/wiki/Sorting_algorithms/Sleep_sort
Sorting algorithms/Sleep sort
Sorting Algorithm This is a sorting algorithm.   It may be applied to a set of data in order to sort it.     For comparing various sorts, see compare sorts.   For other sorting algorithms,   see sorting algorithms,   or: O(n logn) sorts Heap sort | Merge sort | Patience sort | Quick sort O(n log2n) sorts Shell Sort ...
#Wren
Wren
import "timer" for Timer import "io" for Stdout import "os" for Process   var args = Process.arguments var n = args.count if (n < 2) Fiber.abort("There must be at least two arguments passed.") var list = args.map{ |a| Num.fromString(a) }.toList if (list.any { |i| i == null || !i.isInteger || i < 0 } ) { Fiber.abort...
http://rosettacode.org/wiki/Sorting_algorithms/Selection_sort
Sorting algorithms/Selection sort
Sorting Algorithm This is a sorting algorithm.   It may be applied to a set of data in order to sort it.     For comparing various sorts, see compare sorts.   For other sorting algorithms,   see sorting algorithms,   or: O(n logn) sorts Heap sort | Merge sort | Patience sort | Quick sort O(n log2n) sorts Shell Sort ...
#F.23
F#
  let rec ssort = function [] -> [] | x::xs -> let min, rest = List.fold (fun (min,acc) x -> if h<min then (h, min::acc) else (min, h::acc)) (x, []) xs in min::ssort rest  
http://rosettacode.org/wiki/Soundex
Soundex
Soundex is an algorithm for creating indices for words based on their pronunciation. Task The goal is for homophones to be encoded to the same representation so that they can be matched despite minor differences in spelling   (from the   soundex   Wikipedia article). Caution There is a major issue in many of the ...
#Go
Go
package main   import ( "errors" "fmt" "unicode" )   var code = []byte("01230127022455012623017202")   func soundex(s string) (string, error) { var sx [4]byte var sxi int var cx, lastCode byte for i, c := range s { switch { case !unicode.IsLetter(c): if c < ' ' ||...
http://rosettacode.org/wiki/Sorting_algorithms/Shell_sort
Sorting algorithms/Shell sort
Sorting Algorithm This is a sorting algorithm.   It may be applied to a set of data in order to sort it.     For comparing various sorts, see compare sorts.   For other sorting algorithms,   see sorting algorithms,   or: O(n logn) sorts Heap sort | Merge sort | Patience sort | Quick sort O(n log2n) sorts Shell Sort ...
#M2000_Interpreter
M2000 Interpreter
  Module ShellSortExample { Module shellsort(&a()) { DEf h%, i%, j%, k, n% n%=LEN(a()) h% = n% WHILE h% { IF h% = 2 THEN {h% = 1 }ELSE h%= h% DIV 2.2 FOR i% = h% TO n% - 1 k = a(i%) ...
http://rosettacode.org/wiki/Sorting_algorithms/Shell_sort
Sorting algorithms/Shell sort
Sorting Algorithm This is a sorting algorithm.   It may be applied to a set of data in order to sort it.     For comparing various sorts, see compare sorts.   For other sorting algorithms,   see sorting algorithms,   or: O(n logn) sorts Heap sort | Merge sort | Patience sort | Quick sort O(n log2n) sorts Shell Sort ...
#Maple
Maple
shellsort := proc(arr) local n, gap, i, val, j; n := numelems(arr): gap := trunc(n/2): while (gap > 0) do #notice by 1 error for i from gap to n by 1 do val := arr[i]; j := i; while (j > gap and arr[j-gap] > val) do arr[j] := arr[j-gap]; j -= gap; end do; arr[j] := val; end do; gap := t...
http://rosettacode.org/wiki/Stable_marriage_problem
Stable marriage problem
Solve the Stable marriage problem using the Gale/Shapley algorithm. Problem description Given an equal number of men and women to be paired for marriage, each man ranks all the women in order of his preference and each woman ranks all the men in order of her preference. A stable set of engagements for marriage is o...
#zkl
zkl
var Boys=Dictionary( "abe", "abi eve cath ivy jan dee fay bea hope gay".split(), "bob", "cath hope abi dee eve fay bea jan ivy gay".split(), "col", "hope eve abi dee bea fay ivy gay cath jan".split(), "dan", "ivy fay dee gay hope eve jan bea cath abi".split(), "ed", "jan dee bea cath f...
http://rosettacode.org/wiki/Stack
Stack
Data Structure This illustrates a data structure, a means of storing data within a program. You may see other such structures in the Data Structures category. A stack is a container of elements with   last in, first out   access policy.   Sometimes it also called LIFO. The stack is accessed through its top. The ba...
#M2000_Interpreter
M2000 Interpreter
  Module Checkit { a=Stack Stack a { Push 100, 200, 300 } Print StackItem(a, 1)=300 Stack a { Print StackItem(1)=300 While not empty { Read N Print N } } } Checkit  
http://rosettacode.org/wiki/Spiral_matrix
Spiral matrix
Task Produce a spiral array. A   spiral array   is a square arrangement of the first   N2   natural numbers,   where the numbers increase sequentially as you go around the edges of the array spiraling inwards. For example, given   5,   produce this array: 0 1 2 3 4 15 16 17 18 5 14 23 24 19 6 13 22 21 ...
#OCaml
OCaml
let next_dir = function | 1, 0 -> 0, -1 | 0, 1 -> 1, 0 | -1, 0 -> 0, 1 | 0, -1 -> -1, 0 | _ -> assert false   let next_pos ~pos:(x,y) ~dir:(nx,ny) = (x+nx, y+ny)   let next_cell ar ~pos:(x,y) ~dir:(nx,ny) = try ar.(x+nx).(y+ny) with _ -> -2   let for_loop n init fn = let rec aux i v = if...
http://rosettacode.org/wiki/Sorting_algorithms/Radix_sort
Sorting algorithms/Radix sort
Sorting Algorithm This is a sorting algorithm.   It may be applied to a set of data in order to sort it.     For comparing various sorts, see compare sorts.   For other sorting algorithms,   see sorting algorithms,   or: O(n logn) sorts Heap sort | Merge sort | Patience sort | Quick sort O(n log2n) sorts Shell Sort ...
#Phix
Phix
with javascript_semantics function radixSortn(sequence s, integer n) sequence buckets = repeat({},10), res = {} for i=1 to length(s) do integer digit = remainder(floor(s[i]/power(10,n-1)),10)+1 buckets[digit] = append(buckets[digit],s[i]) end for for i=1 to length(buckets) ...
http://rosettacode.org/wiki/Sorting_algorithms/Quicksort
Sorting algorithms/Quicksort
Sorting Algorithm This is a sorting algorithm.   It may be applied to a set of data in order to sort it.     For comparing various sorts, see compare sorts.   For other sorting algorithms,   see sorting algorithms,   or: O(n logn) sorts Heap sort | Merge sort | Patience sort | Quick sort O(n log2n) sorts Shell Sort ...
#BASIC
BASIC
DECLARE SUB quicksort (arr() AS INTEGER, leftN AS INTEGER, rightN AS INTEGER)   DIM q(99) AS INTEGER DIM n AS INTEGER   RANDOMIZE TIMER   FOR n = 0 TO 99 q(n) = INT(RND * 9999) NEXT   OPEN "output.txt" FOR OUTPUT AS 1 FOR n = 0 TO 99 PRINT #1, q(n), NEXT PRINT #1, quicksort q(), 0, 99 FO...
http://rosettacode.org/wiki/Sorting_algorithms/Patience_sort
Sorting algorithms/Patience sort
Sorting Algorithm This is a sorting algorithm.   It may be applied to a set of data in order to sort it.     For comparing various sorts, see compare sorts.   For other sorting algorithms,   see sorting algorithms,   or: O(n logn) sorts Heap sort | Merge sort | Patience sort | Quick sort O(n log2n) sorts Shell Sort ...
#Julia
Julia
function patiencesort(list::Vector{T}) where T piles = Vector{Vector{T}}() for n in list if isempty(piles) || (i = findfirst(pile -> n <= pile[end], piles)) == nothing push!(piles, [n]) else push!(piles[i], n) end end mergesorted(piles) end  ...
http://rosettacode.org/wiki/Sorting_algorithms/Insertion_sort
Sorting algorithms/Insertion sort
Sorting Algorithm This is a sorting algorithm.   It may be applied to a set of data in order to sort it.     For comparing various sorts, see compare sorts.   For other sorting algorithms,   see sorting algorithms,   or: O(n logn) sorts Heap sort | Merge sort | Patience sort | Quick sort O(n log2n) sorts Shell Sort ...
#Arturo
Arturo
insertionSort: function [items][ arr: new items loop 1..(size items)-1 'i [ value: arr\[i] j: i - 1   while [and? -> j >= 0 -> value < arr\[j]] [ arr\[j+1]: arr\[j] j: j - 1 ] arr\[j+1]: value ] return arr ]   ...
http://rosettacode.org/wiki/Sorting_algorithms/Permutation_sort
Sorting algorithms/Permutation sort
Sorting Algorithm This is a sorting algorithm.   It may be applied to a set of data in order to sort it.     For comparing various sorts, see compare sorts.   For other sorting algorithms,   see sorting algorithms,   or: O(n logn) sorts Heap sort | Merge sort | Patience sort | Quick sort O(n log2n) sorts Shell Sort ...
#Prolog
Prolog
permutation_sort(L,S) :- permutation(L,S), sorted(S).   sorted([]). sorted([_]). sorted([X,Y|ZS]) :- X =< Y, sorted([Y|ZS]).   permutation([],[]). permutation([X|XS],YS) :- permutation(XS,ZS), select(X,YS,ZS).
http://rosettacode.org/wiki/Sorting_algorithms/Permutation_sort
Sorting algorithms/Permutation sort
Sorting Algorithm This is a sorting algorithm.   It may be applied to a set of data in order to sort it.     For comparing various sorts, see compare sorts.   For other sorting algorithms,   see sorting algorithms,   or: O(n logn) sorts Heap sort | Merge sort | Patience sort | Quick sort O(n log2n) sorts Shell Sort ...
#PureBasic
PureBasic
Macro reverse(firstIndex, lastIndex) first = firstIndex last = lastIndex While first < last Swap cur(first), cur(last) first + 1 last - 1 Wend EndMacro   Procedure nextPermutation(Array cur(1)) Protected first, last, elementCount = ArraySize(cur()) If elementCount < 2 ProcedureReturn #False...
http://rosettacode.org/wiki/Sorting_algorithms/Heapsort
Sorting algorithms/Heapsort
Sorting Algorithm This is a sorting algorithm.   It may be applied to a set of data in order to sort it.     For comparing various sorts, see compare sorts.   For other sorting algorithms,   see sorting algorithms,   or: O(n logn) sorts Heap sort | Merge sort | Patience sort | Quick sort O(n log2n) sorts Shell Sort ...
#360_Assembly
360 Assembly
* Heap sort 22/06/2016 HEAPS CSECT USING HEAPS,R13 base register B 72(R15) skip savearea DC 17F'0' savearea STM R14,R12,12(R13) prolog ST R13,4(R15) " ST ...
http://rosettacode.org/wiki/Sorting_algorithms/Merge_sort
Sorting algorithms/Merge sort
Sorting Algorithm This is a sorting algorithm.   It may be applied to a set of data in order to sort it.     For comparing various sorts, see compare sorts.   For other sorting algorithms,   see sorting algorithms,   or: O(n logn) sorts Heap sort | Merge sort | Patience sort | Quick sort O(n log2n) sorts Shell Sort ...
#AArch64_Assembly
AArch64 Assembly
  /* ARM assembly AARCH64 Raspberry PI 3B */ /* program mergeSort64.s */   /*******************************************/ /* Constantes file */ /*******************************************/ /* for this file see task include a file in language AArch64 assembly */ .include "../includeConstantesAR...
http://rosettacode.org/wiki/Sorting_algorithms/Pancake_sort
Sorting algorithms/Pancake sort
Sorting Algorithm This is a sorting algorithm.   It may be applied to a set of data in order to sort it.     For comparing various sorts, see compare sorts.   For other sorting algorithms,   see sorting algorithms,   or: O(n logn) sorts Heap sort | Merge sort | Patience sort | Quick sort O(n log2n) sorts Shell Sort ...
#Groovy
Groovy
def makeSwap = { a, i, j = i+1 -> print "."; a[[j,i]] = a[[i,j]] }   def flip = { list, n -> (0..<((n+1)/2)).each { makeSwap(list, it, n-it) } }   def pancakeSort = { list -> def n = list.size() (1..<n).reverse().each { i -> def max = list[0..i].max() def flipPoint = (i..0).find{ list[it] == max...
http://rosettacode.org/wiki/Sorting_algorithms/Stooge_sort
Sorting algorithms/Stooge sort
Sorting Algorithm This is a sorting algorithm.   It may be applied to a set of data in order to sort it.     For comparing various sorts, see compare sorts.   For other sorting algorithms,   see sorting algorithms,   or: O(n logn) sorts Heap sort | Merge sort | Patience sort | Quick sort O(n log2n) sorts Shell Sort ...
#PARI.2FGP
PARI/GP
stoogeSort(v)={ local(v=v); \\ Give children access to v ss(1,#v); \\ Sort v }   ss(i,j)={ my(t); if(v[j]<v[i], t=v[i]; v[i]=v[j]; v[j]=t ); if(j-i > 1, t=(1+j-i)\3; ss(i,j-t); ss(i+t,j); ss(i,j-t) ) };
http://rosettacode.org/wiki/Sorting_algorithms/Sleep_sort
Sorting algorithms/Sleep sort
Sorting Algorithm This is a sorting algorithm.   It may be applied to a set of data in order to sort it.     For comparing various sorts, see compare sorts.   For other sorting algorithms,   see sorting algorithms,   or: O(n logn) sorts Heap sort | Merge sort | Patience sort | Quick sort O(n log2n) sorts Shell Sort ...
#zkl
zkl
vm.arglist.apply(fcn(n){ Atomic.sleep(n); print(n) }.launch); Atomic.waitFor(fcn{ vm.numThreads == 1 }); Atomic.sleep(2); println();
http://rosettacode.org/wiki/Sorting_algorithms/Selection_sort
Sorting algorithms/Selection sort
Sorting Algorithm This is a sorting algorithm.   It may be applied to a set of data in order to sort it.     For comparing various sorts, see compare sorts.   For other sorting algorithms,   see sorting algorithms,   or: O(n logn) sorts Heap sort | Merge sort | Patience sort | Quick sort O(n log2n) sorts Shell Sort ...
#Factor
Factor
USING: kernel math sequences sequences.extras ;   : select ( m n seq -- ) [ dup ] 2dip [ <slice> [ ] infimum-by* drop over + ] [ exchange ] bi ;   : selection-sort! ( seq -- seq' ) [ ] [ length dup ] [ ] tri [ select ] 2curry each-integer ;
http://rosettacode.org/wiki/Sorting_algorithms/Selection_sort
Sorting algorithms/Selection sort
Sorting Algorithm This is a sorting algorithm.   It may be applied to a set of data in order to sort it.     For comparing various sorts, see compare sorts.   For other sorting algorithms,   see sorting algorithms,   or: O(n logn) sorts Heap sort | Merge sort | Patience sort | Quick sort O(n log2n) sorts Shell Sort ...
#Forth
Forth
defer less? ' < is less?   : least ( start end -- least ) over cell+ do i @ over @ less? if drop i then cell +loop ; : selection ( array len -- ) cells over + tuck ( end start end ) cell- swap do ( end ) i over least ( end least ) i @ over @ i ! swap ! cell +loop drop ;   create array 8 , 1 , ...
http://rosettacode.org/wiki/Soundex
Soundex
Soundex is an algorithm for creating indices for words based on their pronunciation. Task The goal is for homophones to be encoded to the same representation so that they can be matched despite minor differences in spelling   (from the   soundex   Wikipedia article). Caution There is a major issue in many of the ...
#Groovy
Groovy
  def soundex(s) { def code = "" def lookup = [ B : 1, F : 1, P : 1, V : 1, C : 2, G : 2, J : 2, K : 2, Q : 2, S : 2, X : 2, Z : 2, D : 3, T : 3, L : 4, M : 5, N : 5, R : 6 ] s[1..-1].toUpperCase().inject(7) { lastCode, letter -> def letterCode = lookup[...
http://rosettacode.org/wiki/Sorting_algorithms/Shell_sort
Sorting algorithms/Shell sort
Sorting Algorithm This is a sorting algorithm.   It may be applied to a set of data in order to sort it.     For comparing various sorts, see compare sorts.   For other sorting algorithms,   see sorting algorithms,   or: O(n logn) sorts Heap sort | Merge sort | Patience sort | Quick sort O(n log2n) sorts Shell Sort ...
#Mathematica.2FWolfram_Language
Mathematica/Wolfram Language
shellSort[ lst_ ] := Module[ {list = lst, incr, temp, i, j}, incr = Round[Length[list]/2]; While[incr > 0,   For[i = incr + 1, i <= Length[list], i++,   temp = list[[i]]; j = i;   While[(j >= (incr + 1)) && (list[[j - incr]] > temp) , list[[j]] = list[[j - incr]]; j = j-incr; ];   list[[j]] = temp;...
http://rosettacode.org/wiki/Sorting_algorithms/Shell_sort
Sorting algorithms/Shell sort
Sorting Algorithm This is a sorting algorithm.   It may be applied to a set of data in order to sort it.     For comparing various sorts, see compare sorts.   For other sorting algorithms,   see sorting algorithms,   or: O(n logn) sorts Heap sort | Merge sort | Patience sort | Quick sort O(n log2n) sorts Shell Sort ...
#MATLAB_.2F_Octave
MATLAB / Octave
function list = shellSort(list)   N = numel(list); increment = round(N/2);   while increment > 0   for i = (increment+1:N) temp = list(i); j = i; while (j >= increment+1) && (list(j-increment) > temp) list(j) = list(j-increment); j ...
http://rosettacode.org/wiki/Stack
Stack
Data Structure This illustrates a data structure, a means of storing data within a program. You may see other such structures in the Data Structures category. A stack is a container of elements with   last in, first out   access policy.   Sometimes it also called LIFO. The stack is accessed through its top. The ba...
#Maple
Maple
with(stack): # load the package, to allow use of short command names   s := stack:-new(a, b):   push(c, s):   # The following statements terminate with a semicolon and print output. top(s); pop(s); pop(s); empty(s); pop(s); empty(s);
http://rosettacode.org/wiki/Spiral_matrix
Spiral matrix
Task Produce a spiral array. A   spiral array   is a square arrangement of the first   N2   natural numbers,   where the numbers increase sequentially as you go around the edges of the array spiraling inwards. For example, given   5,   produce this array: 0 1 2 3 4 15 16 17 18 5 14 23 24 19 6 13 22 21 ...
#Octave
Octave
function a = spiral(n) a = ones(n*n, 1); u = -(i = n) * (v = ones(n, 1)); for k = n-1:-1:1 j = 1:k; a(j+i) = u(j) = -u(j); a(j+(i+k)) = v(j) = -v(j); i += 2*k; endfor a(cumsum(a)) = 1:n*n; a = reshape(a, n, n)'-1; endfunction   >> spiral(5) ans =   0 1 2 3 4 15 16 17 ...
http://rosettacode.org/wiki/Sorting_algorithms/Radix_sort
Sorting algorithms/Radix sort
Sorting Algorithm This is a sorting algorithm.   It may be applied to a set of data in order to sort it.     For comparing various sorts, see compare sorts.   For other sorting algorithms,   see sorting algorithms,   or: O(n logn) sorts Heap sort | Merge sort | Patience sort | Quick sort O(n log2n) sorts Shell Sort ...
#PicoLisp
PicoLisp
(de radixSort (Lst) (let Mask 1 (while (let (Pos (list NIL NIL) Neg (list NIL NIL) Flg) (for N Lst (queue (if2 (ge0 N) (bit? Mask N) (cdr Pos) Pos Neg (cdr Neg) ) N ) (and (>= (abs N) Mask) (on Flg)) )...
http://rosettacode.org/wiki/Sorting_algorithms/Radix_sort
Sorting algorithms/Radix sort
Sorting Algorithm This is a sorting algorithm.   It may be applied to a set of data in order to sort it.     For comparing various sorts, see compare sorts.   For other sorting algorithms,   see sorting algorithms,   or: O(n logn) sorts Heap sort | Merge sort | Patience sort | Quick sort O(n log2n) sorts Shell Sort ...
#PureBasic
PureBasic
Structure bucket List i.i() EndStructure   DataSection ;sets specify the size (1 based) followed by each integer set1: Data.i 10 ;size Data.i 1, 3, 8, 9, 0, 0, 8, 7, 1, 6 ;data set2: Data.i 8 Data.i 170, 45, 75, 90, 2, 24, 802, 66 set3: Data.i 8 Data.i 170, 45, 75, 90, 2, 24, -802, -66 EndDataSec...
http://rosettacode.org/wiki/Sorting_algorithms/Quicksort
Sorting algorithms/Quicksort
Sorting Algorithm This is a sorting algorithm.   It may be applied to a set of data in order to sort it.     For comparing various sorts, see compare sorts.   For other sorting algorithms,   see sorting algorithms,   or: O(n logn) sorts Heap sort | Merge sort | Patience sort | Quick sort O(n log2n) sorts Shell Sort ...
#BCPL
BCPL
// This can be run using Cintcode BCPL freely available from www.cl.cam.ac.uk/users/mr10.   GET "libhdr.h"   LET quicksort(v, n) BE qsort(v+1, v+n)   AND qsort(l, r) BE { WHILE l+8<r DO { LET midpt = (l+r)/2 // Select a good(ish) median value. LET val = middle(!l, !midpt, !r) LET i = partition(val, l, r...
http://rosettacode.org/wiki/Sorting_algorithms/Patience_sort
Sorting algorithms/Patience sort
Sorting Algorithm This is a sorting algorithm.   It may be applied to a set of data in order to sort it.     For comparing various sorts, see compare sorts.   For other sorting algorithms,   see sorting algorithms,   or: O(n logn) sorts Heap sort | Merge sort | Patience sort | Quick sort O(n log2n) sorts Shell Sort ...
#Kotlin
Kotlin
// version 1.1.2   fun <T : Comparable<T>> patienceSort(arr: Array<T>) { if (arr.size < 2) return val piles = mutableListOf<MutableList<T>>() outer@ for (el in arr) { for (pile in piles) { if (pile.last() > el) { pile.add(el) continue@outer } ...
http://rosettacode.org/wiki/Sorting_algorithms/Insertion_sort
Sorting algorithms/Insertion sort
Sorting Algorithm This is a sorting algorithm.   It may be applied to a set of data in order to sort it.     For comparing various sorts, see compare sorts.   For other sorting algorithms,   see sorting algorithms,   or: O(n logn) sorts Heap sort | Merge sort | Patience sort | Quick sort O(n log2n) sorts Shell Sort ...
#AutoHotkey
AutoHotkey
MsgBox % InsertionSort("") MsgBox % InsertionSort("xxx") MsgBox % InsertionSort("3,2,1") MsgBox % InsertionSort("dog,000000,xx,cat,pile,abcde,1,cat,zz,xx,z")   InsertionSort(var) { ; SORT COMMA SEPARATED LIST StringSplit a, var, `, ; make array, size = a0 Loop % a0-1 { i :...
http://rosettacode.org/wiki/Sorting_algorithms/Permutation_sort
Sorting algorithms/Permutation sort
Sorting Algorithm This is a sorting algorithm.   It may be applied to a set of data in order to sort it.     For comparing various sorts, see compare sorts.   For other sorting algorithms,   see sorting algorithms,   or: O(n logn) sorts Heap sort | Merge sort | Patience sort | Quick sort O(n log2n) sorts Shell Sort ...
#Python
Python
from itertools import permutations   in_order = lambda s: all(x <= s[i+1] for i,x in enumerate(s[:-1])) perm_sort = lambda s: (p for p in permutations(s) if in_order(p)).next()
http://rosettacode.org/wiki/Sorting_algorithms/Permutation_sort
Sorting algorithms/Permutation sort
Sorting Algorithm This is a sorting algorithm.   It may be applied to a set of data in order to sort it.     For comparing various sorts, see compare sorts.   For other sorting algorithms,   see sorting algorithms,   or: O(n logn) sorts Heap sort | Merge sort | Patience sort | Quick sort O(n log2n) sorts Shell Sort ...
#Quackery
Quackery
[ 1 swap times [ i 1+ * ] ] is ! ( n --> n )   [ [] unrot 1 - times [ i 1+ ! /mod dip join ] drop ] is factoradic ( n n --> [ )   [ [] unrot witheach [ pluck rot swap nested join swap ] join ] is inversion ( [ [ --> [ )   [ over size ...
http://rosettacode.org/wiki/Sorting_algorithms/Heapsort
Sorting algorithms/Heapsort
Sorting Algorithm This is a sorting algorithm.   It may be applied to a set of data in order to sort it.     For comparing various sorts, see compare sorts.   For other sorting algorithms,   see sorting algorithms,   or: O(n logn) sorts Heap sort | Merge sort | Patience sort | Quick sort O(n log2n) sorts Shell Sort ...
#AArch64_Assembly
AArch64 Assembly
  /* ARM assembly AARCH64 Raspberry PI 3B */ /* program heapSort64.s */ /* look Pseudocode begin this task */   /*******************************************/ /* Constantes file */ /*******************************************/ /* for this file see task include a file in language AArch64 assem...
http://rosettacode.org/wiki/Sorting_algorithms/Merge_sort
Sorting algorithms/Merge sort
Sorting Algorithm This is a sorting algorithm.   It may be applied to a set of data in order to sort it.     For comparing various sorts, see compare sorts.   For other sorting algorithms,   see sorting algorithms,   or: O(n logn) sorts Heap sort | Merge sort | Patience sort | Quick sort O(n log2n) sorts Shell Sort ...
#ACL2
ACL2
(defun split (xys) (if (endp (rest xys)) (mv xys nil) (mv-let (xs ys) (split (rest (rest xys))) (mv (cons (first xys) xs) (cons (second xys) ys)))))   (defun mrg (xs ys) (declare (xargs :measure (+ (len xs) (len ys)))) (cond ((endp xs) ys) ((endp ys...
http://rosettacode.org/wiki/Sorting_algorithms/Pancake_sort
Sorting algorithms/Pancake sort
Sorting Algorithm This is a sorting algorithm.   It may be applied to a set of data in order to sort it.     For comparing various sorts, see compare sorts.   For other sorting algorithms,   see sorting algorithms,   or: O(n logn) sorts Heap sort | Merge sort | Patience sort | Quick sort O(n log2n) sorts Shell Sort ...
#Haskell
Haskell
import Data.List import Control.Arrow import Control.Monad import Data.Maybe   dblflipIt :: (Ord a) => [a] -> [a] dblflipIt = uncurry ((reverse.).(++)). first reverse . ap (flip splitAt) (succ. fromJust. (elemIndex =<< maximum))   dopancakeSort :: (Ord a) => [a] -> [a] dopancakeSort xs = dopcs (xs,[]) where dopcs (...
http://rosettacode.org/wiki/Sorting_algorithms/Stooge_sort
Sorting algorithms/Stooge sort
Sorting Algorithm This is a sorting algorithm.   It may be applied to a set of data in order to sort it.     For comparing various sorts, see compare sorts.   For other sorting algorithms,   see sorting algorithms,   or: O(n logn) sorts Heap sort | Merge sort | Patience sort | Quick sort O(n log2n) sorts Shell Sort ...
#Pascal
Pascal
program StoogeSortDemo;   type TIntArray = array of integer;   procedure stoogeSort(var m: TIntArray; i, j: integer); var t, temp: integer; begin if m[j] < m[i] then begin temp := m[j]; m[j] := m[i]; m[i] := temp; end; if j - i > 1 then begin t := (j - i + 1) div 3;...
http://rosettacode.org/wiki/Sorting_algorithms/Selection_sort
Sorting algorithms/Selection sort
Sorting Algorithm This is a sorting algorithm.   It may be applied to a set of data in order to sort it.     For comparing various sorts, see compare sorts.   For other sorting algorithms,   see sorting algorithms,   or: O(n logn) sorts Heap sort | Merge sort | Patience sort | Quick sort O(n log2n) sorts Shell Sort ...
#Fortran
Fortran
PROGRAM SELECTION   IMPLICIT NONE   INTEGER :: intArray(10) = (/ 4, 9, 3, -2, 0, 7, -5, 1, 6, 8 /)   WRITE(*,"(A,10I5)") "Unsorted array:", intArray CALL Selection_sort(intArray) WRITE(*,"(A,10I5)") "Sorted array  :", intArray   CONTAINS   SUBROUTINE Selection_sort(a) INTEGER, INTENT(IN OUT) :: a(:) ...
http://rosettacode.org/wiki/Soundex
Soundex
Soundex is an algorithm for creating indices for words based on their pronunciation. Task The goal is for homophones to be encoded to the same representation so that they can be matched despite minor differences in spelling   (from the   soundex   Wikipedia article). Caution There is a major issue in many of the ...
#Haskell
Haskell
import Text.PhoneticCode.Soundex   main :: IO () main = mapM_ print $ ((,) <*> soundexSimple) <$> ["Soundex", "Example", "Sownteks", "Ekzampul"]
http://rosettacode.org/wiki/Sorting_algorithms/Shell_sort
Sorting algorithms/Shell sort
Sorting Algorithm This is a sorting algorithm.   It may be applied to a set of data in order to sort it.     For comparing various sorts, see compare sorts.   For other sorting algorithms,   see sorting algorithms,   or: O(n logn) sorts Heap sort | Merge sort | Patience sort | Quick sort O(n log2n) sorts Shell Sort ...
#NetRexx
NetRexx
/* NetRexx */ options replace format comments java crossref savelog symbols binary   placesList = [String - "UK London", "US New York", "US Boston", "US Washington" - , "UK Washington", "US Birmingham", "UK Birmingham", "UK Boston" - ] sortedList = shellSort(String[] Arrays.copyOf(placesList...
http://rosettacode.org/wiki/Stack
Stack
Data Structure This illustrates a data structure, a means of storing data within a program. You may see other such structures in the Data Structures category. A stack is a container of elements with   last in, first out   access policy.   Sometimes it also called LIFO. The stack is accessed through its top. The ba...
#Mathematica.2FWolfram_Language
Mathematica/Wolfram Language
EmptyQ[a_] := If[Length[a] == 0, True, False] SetAttributes[Push, HoldAll];[a_, elem_] := AppendTo[a, elem] SetAttributes[Pop, HoldAllComplete]; Pop[a_] := If[EmptyQ[a], False, b = Last[a]; Set[a, Most[a]]; b] Peek[a_] := If[EmptyQ[a], False, Last[a]]   Example use: stack = {};Push[stack, 1]; Push[stack, 2]; Push[stac...
http://rosettacode.org/wiki/Spiral_matrix
Spiral matrix
Task Produce a spiral array. A   spiral array   is a square arrangement of the first   N2   natural numbers,   where the numbers increase sequentially as you go around the edges of the array spiraling inwards. For example, given   5,   produce this array: 0 1 2 3 4 15 16 17 18 5 14 23 24 19 6 13 22 21 ...
#ooRexx
ooRexx
  call printArray generateArray(3) say call printArray generateArray(4) say call printArray generateArray(5)   ::routine generateArray use arg dimension -- the output array array = .array~new(dimension, dimension)   -- get the number of squares, including the center one if -- the dimension is odd squares = ...
http://rosettacode.org/wiki/Sorting_algorithms/Radix_sort
Sorting algorithms/Radix sort
Sorting Algorithm This is a sorting algorithm.   It may be applied to a set of data in order to sort it.     For comparing various sorts, see compare sorts.   For other sorting algorithms,   see sorting algorithms,   or: O(n logn) sorts Heap sort | Merge sort | Patience sort | Quick sort O(n log2n) sorts Shell Sort ...
#Python
Python
#python2.6 < from math import log   def getDigit(num, base, digit_num): # pulls the selected digit return (num // base ** digit_num) % base   def makeBlanks(size): # create a list of empty lists to hold the split by digit return [ [] for i in range(size) ]   def split(a_list, base, digit_num): b...
http://rosettacode.org/wiki/Sorting_algorithms/Quicksort
Sorting algorithms/Quicksort
Sorting Algorithm This is a sorting algorithm.   It may be applied to a set of data in order to sort it.     For comparing various sorts, see compare sorts.   For other sorting algorithms,   see sorting algorithms,   or: O(n logn) sorts Heap sort | Merge sort | Patience sort | Quick sort O(n log2n) sorts Shell Sort ...
#Beads
Beads
beads 1 program Quicksort   calc main_init var arr = [1, 3, 5, 1, 7, 9, 8, 6, 4, 2] var arr2 = arr quicksort(arr, 1, tree_count(arr)) var tempStr : str loop across:arr index:ix tempStr = tempStr & ' ' & to_str(arr[ix]) log tempStr   calc quicksort( arr:array of num startIndex highIndex ) if (startIndex < h...
http://rosettacode.org/wiki/Sorting_algorithms/Patience_sort
Sorting algorithms/Patience sort
Sorting Algorithm This is a sorting algorithm.   It may be applied to a set of data in order to sort it.     For comparing various sorts, see compare sorts.   For other sorting algorithms,   see sorting algorithms,   or: O(n logn) sorts Heap sort | Merge sort | Patience sort | Quick sort O(n log2n) sorts Shell Sort ...
#Mercury
Mercury
:- module patience_sort_task.   :- interface. :- import_module io. :- pred main(io::di, io::uo) is det.   :- implementation. :- import_module array. :- import_module int. :- import_module list. :- import_module string.   %%%------------------------------------------------------------------- %%% %%% patience_sort/5 -- s...
http://rosettacode.org/wiki/Sorting_algorithms/Insertion_sort
Sorting algorithms/Insertion sort
Sorting Algorithm This is a sorting algorithm.   It may be applied to a set of data in order to sort it.     For comparing various sorts, see compare sorts.   For other sorting algorithms,   see sorting algorithms,   or: O(n logn) sorts Heap sort | Merge sort | Patience sort | Quick sort O(n log2n) sorts Shell Sort ...
#AWK
AWK
{ line[NR] = $0 } END { # sort it with insertion sort for(i=1; i <= NR; i++) { value = line[i] j = i - 1 while( ( j > 0) && ( line[j] > value ) ) { line[j+1] = line[j] j-- } line[j+1] = value } #print it for(i=1; i <= NR; i++) { print line[i] } }
http://rosettacode.org/wiki/Sorting_algorithms/Permutation_sort
Sorting algorithms/Permutation sort
Sorting Algorithm This is a sorting algorithm.   It may be applied to a set of data in order to sort it.     For comparing various sorts, see compare sorts.   For other sorting algorithms,   see sorting algorithms,   or: O(n logn) sorts Heap sort | Merge sort | Patience sort | Quick sort O(n log2n) sorts Shell Sort ...
#R
R
permutationsort <- function(x) { if(!require(e1071) stop("the package e1071 is required") is.sorted <- function(x) all(diff(x) >= 0)   perms <- permutations(length(x)) i <- 1 while(!is.sorted(x)) { x <- x[perms[i,]] i <- i + 1 } x } permutationsort(c(1, 10, 9, 7, 3, 0))
http://rosettacode.org/wiki/Sorting_algorithms/Permutation_sort
Sorting algorithms/Permutation sort
Sorting Algorithm This is a sorting algorithm.   It may be applied to a set of data in order to sort it.     For comparing various sorts, see compare sorts.   For other sorting algorithms,   see sorting algorithms,   or: O(n logn) sorts Heap sort | Merge sort | Patience sort | Quick sort O(n log2n) sorts Shell Sort ...
#Racket
Racket
  #lang racket (define (sort l) (for/first ([p (in-permutations l)] #:when (apply <= p)) p)) (sort '(6 1 5 2 4 3)) ; => '(1 2 3 4 5 6)  
http://rosettacode.org/wiki/Sorting_algorithms/Heapsort
Sorting algorithms/Heapsort
Sorting Algorithm This is a sorting algorithm.   It may be applied to a set of data in order to sort it.     For comparing various sorts, see compare sorts.   For other sorting algorithms,   see sorting algorithms,   or: O(n logn) sorts Heap sort | Merge sort | Patience sort | Quick sort O(n log2n) sorts Shell Sort ...
#ActionScript
ActionScript
function heapSort(data:Vector.<int>):Vector.<int> { for (var start:int = (data.length-2)/2; start >= 0; start--) { siftDown(data, start, data.length); } for (var end:int = data.length - 1; end > 0; end--) { var tmp:int=data[0]; data[0]=data[end]; data[end]=tmp; siftDown(data, 0, end); } return data; } fu...
http://rosettacode.org/wiki/Sorting_algorithms/Merge_sort
Sorting algorithms/Merge sort
Sorting Algorithm This is a sorting algorithm.   It may be applied to a set of data in order to sort it.     For comparing various sorts, see compare sorts.   For other sorting algorithms,   see sorting algorithms,   or: O(n logn) sorts Heap sort | Merge sort | Patience sort | Quick sort O(n log2n) sorts Shell Sort ...
#Action.21
Action!
DEFINE MAX_COUNT="100"   PROC PrintArray(INT ARRAY a INT size) INT i   Put('[) FOR i=0 TO size-1 DO IF i>0 THEN Put(' ) FI PrintI(a(i)) OD Put(']) PutE() RETURN   PROC Merge(INT ARRAY a INT first,mid,last) INT ARRAY left(MAX_COUNT),right(MAX_COUNT) INT leftSize,rightSize,i,j,k   leftSize=mid-f...
http://rosettacode.org/wiki/Sorting_algorithms/Pancake_sort
Sorting algorithms/Pancake sort
Sorting Algorithm This is a sorting algorithm.   It may be applied to a set of data in order to sort it.     For comparing various sorts, see compare sorts.   For other sorting algorithms,   see sorting algorithms,   or: O(n logn) sorts Heap sort | Merge sort | Patience sort | Quick sort O(n log2n) sorts Shell Sort ...
#Haxe
Haxe
class PancakeSort { @:generic inline private static function flip<T>(arr:Array<T>, num:Int) { var i = 0; while (i < --num) { var temp = arr[i]; arr[i++] = arr[num]; arr[num] = temp; } }   @:generic public static function sort<T>(arr:Array<T>) { if (arr.length < 2) return;  ...
http://rosettacode.org/wiki/Sorting_algorithms/Pancake_sort
Sorting algorithms/Pancake sort
Sorting Algorithm This is a sorting algorithm.   It may be applied to a set of data in order to sort it.     For comparing various sorts, see compare sorts.   For other sorting algorithms,   see sorting algorithms,   or: O(n logn) sorts Heap sort | Merge sort | Patience sort | Quick sort O(n log2n) sorts Shell Sort ...
#Icon_and_Unicon
Icon and Unicon
procedure main() #: demonstrate various ways to sort a list and string demosort(pancakesort,[3, 14, 1, 5, 9, 2, 6, 3],"qwerty") pancakeflip := pancakeflipshow # replace pancakeflip procedure with a variant that displays each flip pancakesort([3, 14,...
http://rosettacode.org/wiki/Sorting_algorithms/Stooge_sort
Sorting algorithms/Stooge sort
Sorting Algorithm This is a sorting algorithm.   It may be applied to a set of data in order to sort it.     For comparing various sorts, see compare sorts.   For other sorting algorithms,   see sorting algorithms,   or: O(n logn) sorts Heap sort | Merge sort | Patience sort | Quick sort O(n log2n) sorts Shell Sort ...
#Perl
Perl
sub stooge { use integer; my ($x, $i, $j) = @_;   $i //= 0; $j //= $#$x;   if ( $x->[$j] < $x->[$i] ) { @$x[$i, $j] = @$x[$j, $i]; } if ( $j - $i > 1 ) { my $t = ($j - $i + 1) / 3; stooge( $x, $i, $j - $t ); ...
http://rosettacode.org/wiki/Sorting_algorithms/Selection_sort
Sorting algorithms/Selection sort
Sorting Algorithm This is a sorting algorithm.   It may be applied to a set of data in order to sort it.     For comparing various sorts, see compare sorts.   For other sorting algorithms,   see sorting algorithms,   or: O(n logn) sorts Heap sort | Merge sort | Patience sort | Quick sort O(n log2n) sorts Shell Sort ...
#FreeBASIC
FreeBASIC
' version 03-12-2016 ' compile with: fbc -s console ' for boundry checks on array's compile with: fbc -s console -exx   Sub selectionsort(arr() As Long)   ' sort from lower bound to the highter bound ' array's can have subscript range from -2147483648 to +2147483647   Dim As Long i, j, x Dim As Long lb ...
http://rosettacode.org/wiki/Soundex
Soundex
Soundex is an algorithm for creating indices for words based on their pronunciation. Task The goal is for homophones to be encoded to the same representation so that they can be matched despite minor differences in spelling   (from the   soundex   Wikipedia article). Caution There is a major issue in many of the ...
#Icon_and_Unicon
Icon and Unicon
procedure main(arglist) # computes soundex of each argument every write(x := !arglist, " => ",soundex(x)) end   procedure soundex(name) local dig,i,x static con initial { # construct mapping x[i] => i all else . x := ["bfpv","cgjkqsxz","dt","l","mn","r"] ...
http://rosettacode.org/wiki/Sorting_algorithms/Shell_sort
Sorting algorithms/Shell sort
Sorting Algorithm This is a sorting algorithm.   It may be applied to a set of data in order to sort it.     For comparing various sorts, see compare sorts.   For other sorting algorithms,   see sorting algorithms,   or: O(n logn) sorts Heap sort | Merge sort | Patience sort | Quick sort O(n log2n) sorts Shell Sort ...
#Nim
Nim
proc shellSort[T](a: var openarray[T]) = var h = a.len while h > 0: h = h div 2 for i in h ..< a.len: let k = a[i] var j = i while j >= h and k < a[j-h]: a[j] = a[j-h] j -= h a[j] = k   var a = @[4, 65, 2, -31, 0, 99, 2, 83, 782] shellSort a echo a
http://rosettacode.org/wiki/Sorting_algorithms/Shell_sort
Sorting algorithms/Shell sort
Sorting Algorithm This is a sorting algorithm.   It may be applied to a set of data in order to sort it.     For comparing various sorts, see compare sorts.   For other sorting algorithms,   see sorting algorithms,   or: O(n logn) sorts Heap sort | Merge sort | Patience sort | Quick sort O(n log2n) sorts Shell Sort ...
#Objeck
Objeck
  bundle Default { class ShellSort { function : Main(args : String[]) ~ Nil { a := [1, 3, 7, 21, 48, 112,336, 861, 1968, 4592, 13776,33936, 86961, 198768, 463792, 1391376,3402672, 8382192, 21479367, 49095696, 114556624,343669872, 52913488, 2085837936]; Shell(a); each(i : a) { IO.Console-...
http://rosettacode.org/wiki/Stack
Stack
Data Structure This illustrates a data structure, a means of storing data within a program. You may see other such structures in the Data Structures category. A stack is a container of elements with   last in, first out   access policy.   Sometimes it also called LIFO. The stack is accessed through its top. The ba...
#MATLAB_.2F_Octave
MATLAB / Octave
mystack = {};   % push mystack{end+1} = x;   %pop x = mystack{end}; mystack{end} = [];   %peek,top x = mystack{end};   % empty isempty(mystack)
http://rosettacode.org/wiki/Spiral_matrix
Spiral matrix
Task Produce a spiral array. A   spiral array   is a square arrangement of the first   N2   natural numbers,   where the numbers increase sequentially as you go around the edges of the array spiraling inwards. For example, given   5,   produce this array: 0 1 2 3 4 15 16 17 18 5 14 23 24 19 6 13 22 21 ...
#Oz
Oz
declare fun {Spiral N} %% create nested array Arr = {Array.new 1 N unit} for Y in 1..N do Arr.Y := {Array.new 1 N 0} end %% fill it recursively with increasing numbers C = {Counter 0} in {Fill Arr 1 N C} Arr end   proc {Fill Arr S E C} %% go right for X in S..E do ...
http://rosettacode.org/wiki/Sorting_algorithms/Radix_sort
Sorting algorithms/Radix sort
Sorting Algorithm This is a sorting algorithm.   It may be applied to a set of data in order to sort it.     For comparing various sorts, see compare sorts.   For other sorting algorithms,   see sorting algorithms,   or: O(n logn) sorts Heap sort | Merge sort | Patience sort | Quick sort O(n log2n) sorts Shell Sort ...
#QB64
QB64
  #lang QB64 '* don't be an a$$. Keep this credit notice with the source: '* written/refactored by CodeGuy, 2018. '* also works with negative numbers. TESTN& = 63 A$ = "" REDIM b(0 TO TESTN&) AS DOUBLE FOR s& = -1 TO 1 STEP 2 A$ = A$ + CHR$(13) + CHR$(10) + "Random order:" FOR i = 0 TO TESTN& b(i) = (10...
http://rosettacode.org/wiki/Sorting_algorithms/Radix_sort
Sorting algorithms/Radix sort
Sorting Algorithm This is a sorting algorithm.   It may be applied to a set of data in order to sort it.     For comparing various sorts, see compare sorts.   For other sorting algorithms,   see sorting algorithms,   or: O(n logn) sorts Heap sort | Merge sort | Patience sort | Quick sort O(n log2n) sorts Shell Sort ...
#Quackery
Quackery
[ stack ] is digit ( --> s )   [ behead swap witheach min ] is smallest ( [ --> n )   [ [] over smallest rot witheach [ over - rot swap join swap ] swap 0 digit put dup size temp put [ ' [ [ ] ] 16 of constant swap witheach [ dup dip ...
http://rosettacode.org/wiki/Sorting_algorithms/Quicksort
Sorting algorithms/Quicksort
Sorting Algorithm This is a sorting algorithm.   It may be applied to a set of data in order to sort it.     For comparing various sorts, see compare sorts.   For other sorting algorithms,   see sorting algorithms,   or: O(n logn) sorts Heap sort | Merge sort | Patience sort | Quick sort O(n log2n) sorts Shell Sort ...
#Bracmat
Bracmat
( ( Q = Less Greater Equal pivot element .  !arg:%(?pivot:?Equal) %?arg & :?Less:?Greater & whl ' ( !arg:%?element ?arg & (.!element)+(.!pivot) { BAD: 1900+90 adds to 1990, GOOD: (.1900)+(.90) is sorted to (.90)+(.1900) }  : ( (.!element...
http://rosettacode.org/wiki/Sorting_algorithms/Patience_sort
Sorting algorithms/Patience sort
Sorting Algorithm This is a sorting algorithm.   It may be applied to a set of data in order to sort it.     For comparing various sorts, see compare sorts.   For other sorting algorithms,   see sorting algorithms,   or: O(n logn) sorts Heap sort | Merge sort | Patience sort | Quick sort O(n log2n) sorts Shell Sort ...
#Modula-2
Modula-2
MODULE PatienceSortTask;   FROM STextIO IMPORT WriteString; FROM STextIO IMPORT WriteLn; FROM WholeStr IMPORT IntToStr;   CONST MaxSortSize = 1024; (* A power of two. *) MaxWinnersSize = (2 * MaxSortSize) - 1;   TYPE PilesArrayType = ARRAY [1 .. MaxSortSize] OF INTEGER; WinnersArrayType = ARRAY [1 .. M...
http://rosettacode.org/wiki/Sorting_algorithms/Insertion_sort
Sorting algorithms/Insertion sort
Sorting Algorithm This is a sorting algorithm.   It may be applied to a set of data in order to sort it.     For comparing various sorts, see compare sorts.   For other sorting algorithms,   see sorting algorithms,   or: O(n logn) sorts Heap sort | Merge sort | Patience sort | Quick sort O(n log2n) sorts Shell Sort ...
#Bash
Bash
#!/bin/bash   # Sorting integers with insertion sort   function insertion_sort () { # input: unsorted integer array # output: sorted integer array (ascending)   # local variables local -a arr # array local -i i # integers local -i j local -i key local -i prev loca...
http://rosettacode.org/wiki/Sorting_algorithms/Permutation_sort
Sorting algorithms/Permutation sort
Sorting Algorithm This is a sorting algorithm.   It may be applied to a set of data in order to sort it.     For comparing various sorts, see compare sorts.   For other sorting algorithms,   see sorting algorithms,   or: O(n logn) sorts Heap sort | Merge sort | Patience sort | Quick sort O(n log2n) sorts Shell Sort ...
#Raku
Raku
# Lexicographic permuter from "Permutations" task. sub next_perm ( @a ) { my $j = @a.end - 1; $j-- while $j >= 1 and [>] @a[ $j, $j+1 ];   my $aj = @a[$j]; my $k = @a.end; $k-- while [>] $aj, @a[$k];   @a[ $j, $k ] .= reverse;   my Int $r = @a.end; my Int $s = $j + 1; while $r > $s ...
http://rosettacode.org/wiki/Sorting_algorithms/Heapsort
Sorting algorithms/Heapsort
Sorting Algorithm This is a sorting algorithm.   It may be applied to a set of data in order to sort it.     For comparing various sorts, see compare sorts.   For other sorting algorithms,   see sorting algorithms,   or: O(n logn) sorts Heap sort | Merge sort | Patience sort | Quick sort O(n log2n) sorts Shell Sort ...
#Ada
Ada
generic type Element_Type is private; type Index_Type is (<>); type Collection is array(Index_Type range <>) of Element_Type; with function "<" (Left, right : element_type) return boolean is <>; procedure Generic_Heapsort(Item : in out Collection);
http://rosettacode.org/wiki/Sorting_algorithms/Merge_sort
Sorting algorithms/Merge sort
Sorting Algorithm This is a sorting algorithm.   It may be applied to a set of data in order to sort it.     For comparing various sorts, see compare sorts.   For other sorting algorithms,   see sorting algorithms,   or: O(n logn) sorts Heap sort | Merge sort | Patience sort | Quick sort O(n log2n) sorts Shell Sort ...
#ActionScript
ActionScript
function mergesort(a:Array) { //Arrays of length 1 and 0 are always sorted if(a.length <= 1) return a; else { var middle:uint = a.length/2; //split the array into two var left:Array = new Array(middle); var right:Array = new Array(a.length-middle); var j:uint = 0, k:uint = 0; //fill the left array for...
http://rosettacode.org/wiki/Sorting_algorithms/Pancake_sort
Sorting algorithms/Pancake sort
Sorting Algorithm This is a sorting algorithm.   It may be applied to a set of data in order to sort it.     For comparing various sorts, see compare sorts.   For other sorting algorithms,   see sorting algorithms,   or: O(n logn) sorts Heap sort | Merge sort | Patience sort | Quick sort O(n log2n) sorts Shell Sort ...
#J
J
flip=: C.~ C.@i.@- unsorted=: #~ 1 , [: >./\. 2 >/\ ] FlDown=: flip 1 + (i. >./)@unsorted FlipUp=: flip 1 >. [:+/>./\&|.@(< {.)   pancake=: FlipUp@FlDown^:_
http://rosettacode.org/wiki/Sorting_algorithms/Pancake_sort
Sorting algorithms/Pancake sort
Sorting Algorithm This is a sorting algorithm.   It may be applied to a set of data in order to sort it.     For comparing various sorts, see compare sorts.   For other sorting algorithms,   see sorting algorithms,   or: O(n logn) sorts Heap sort | Merge sort | Patience sort | Quick sort O(n log2n) sorts Shell Sort ...
#Java
Java
  public class PancakeSort { int[] heap;   public String toString() { String info = ""; for (int x: heap) info += x + " "; return info; }   public void flip(int n) { for (int i = 0; i < (n+1) / 2; ++i) { int tmp = heap[i]; heap[i] = heap[n-i]; heap...
http://rosettacode.org/wiki/Sorting_algorithms/Stooge_sort
Sorting algorithms/Stooge sort
Sorting Algorithm This is a sorting algorithm.   It may be applied to a set of data in order to sort it.     For comparing various sorts, see compare sorts.   For other sorting algorithms,   see sorting algorithms,   or: O(n logn) sorts Heap sort | Merge sort | Patience sort | Quick sort O(n log2n) sorts Shell Sort ...
#Phix
Phix
with javascript_semantics function stoogesort(sequence s, integer i=1, j=length(s)) if s[j]<s[i] then {s[i],s[j]} = {s[j],s[i]} end if if j-i>1 then integer t = floor((j-i+1)/3) s = stoogesort(s,i, j-t) s = stoogesort(s,i+t,j ) s = stoogesort(s,i, j-t) end if ...
http://rosettacode.org/wiki/Sorting_algorithms/Selection_sort
Sorting algorithms/Selection sort
Sorting Algorithm This is a sorting algorithm.   It may be applied to a set of data in order to sort it.     For comparing various sorts, see compare sorts.   For other sorting algorithms,   see sorting algorithms,   or: O(n logn) sorts Heap sort | Merge sort | Patience sort | Quick sort O(n log2n) sorts Shell Sort ...
#Gambas
Gambas
  siLow As Short = -99 'Set the lowest value number to create siHigh As Short = 99 'Set the highest value number to create siQty As Short = 20 'Set the quantity of numbers to create   Public Sub Main() Dim siToSort As Short[] = CreateNumbersToSort() Dim siPos, siLow, siChar, siCount As Short   PrintOut("To sort: ",...
http://rosettacode.org/wiki/Soundex
Soundex
Soundex is an algorithm for creating indices for words based on their pronunciation. Task The goal is for homophones to be encoded to the same representation so that they can be matched despite minor differences in spelling   (from the   soundex   Wikipedia article). Caution There is a major issue in many of the ...
#IS-BASIC
IS-BASIC
100 PROGRAM "Soundex.bas" 110 FOR I=1 TO 20 120 READ NAME$ 130 PRINT """";NAME$;"""";TAB(20);SOUNDEX$(NAME$) 140 NEXT 150 DEF SOUNDEX$(NAME$) 160 NUMERIC I,N,P 170 LET NAME$=UCASE$(NAME$):LET S$=NAME$(1) 180 LET N$="01230129022455012623019202" 190 LET P=VAL(N$(ORD(S$)-64)) 200 FOR I=2 TO LEN(NAME$) 210 ...
http://rosettacode.org/wiki/Sorting_algorithms/Shell_sort
Sorting algorithms/Shell sort
Sorting Algorithm This is a sorting algorithm.   It may be applied to a set of data in order to sort it.     For comparing various sorts, see compare sorts.   For other sorting algorithms,   see sorting algorithms,   or: O(n logn) sorts Heap sort | Merge sort | Patience sort | Quick sort O(n log2n) sorts Shell Sort ...
#OCaml
OCaml
let shellsort a = let len = Array.length a in let incSequence = [| 412771; 165103; 66041; 26417; 10567; 4231; 1693; 673; 269; 107; 43; 17; 7; 3; 1 |] in   Array.iter (fun increment -> if (increment * 2) <= len then for i = increment to pred len do let temp = a.(i) in ...
http://rosettacode.org/wiki/Stack
Stack
Data Structure This illustrates a data structure, a means of storing data within a program. You may see other such structures in the Data Structures category. A stack is a container of elements with   last in, first out   access policy.   Sometimes it also called LIFO. The stack is accessed through its top. The ba...
#Maxima
Maxima
/* lists can be used as stacks; Maxima provides pop and push */   load(basic)$   a: []$ push(25, a)$ push(7, a)$ pop(a);   emptyp(a); length(a);
http://rosettacode.org/wiki/Spiral_matrix
Spiral matrix
Task Produce a spiral array. A   spiral array   is a square arrangement of the first   N2   natural numbers,   where the numbers increase sequentially as you go around the edges of the array spiraling inwards. For example, given   5,   produce this array: 0 1 2 3 4 15 16 17 18 5 14 23 24 19 6 13 22 21 ...
#PARI.2FGP
PARI/GP
spiral(dim) = { my (M = matrix(dim, dim), p = s = 1, q = i = 0); for (n=1, dim, for (b=1, dim-n+1, M[p,q+=s] = i; i++); for (b=1, dim-n, M[p+=s,q] = i; i++); s = -s; ); M }
http://rosettacode.org/wiki/Sorting_algorithms/Radix_sort
Sorting algorithms/Radix sort
Sorting Algorithm This is a sorting algorithm.   It may be applied to a set of data in order to sort it.     For comparing various sorts, see compare sorts.   For other sorting algorithms,   see sorting algorithms,   or: O(n logn) sorts Heap sort | Merge sort | Patience sort | Quick sort O(n log2n) sorts Shell Sort ...
#Racket
Racket
  #lang Racket (define (radix-sort l r) (define queues (for/vector #:length r ([_ r]) (make-queue))) (let loop ([l l] [R 1]) (define all-zero? #t) (for ([x (in-list l)]) (define x/R (quotient x R)) (enqueue! (vector-ref queues (modulo x/R r)) x) (unless (zero? x/R) (set! all-zero? #f))) ...
http://rosettacode.org/wiki/Sorting_algorithms/Radix_sort
Sorting algorithms/Radix sort
Sorting Algorithm This is a sorting algorithm.   It may be applied to a set of data in order to sort it.     For comparing various sorts, see compare sorts.   For other sorting algorithms,   see sorting algorithms,   or: O(n logn) sorts Heap sort | Merge sort | Patience sort | Quick sort O(n log2n) sorts Shell Sort ...
#Raku
Raku
sub radsort (@ints) { my $maxlen = max @ints».chars; my @list = @ints».fmt("\%0{$maxlen}d");   for reverse ^$maxlen -> $r { my @buckets = @list.classify( *.substr($r,1) ).sort: *.key; @buckets[0].value = @buckets[0].value.reverse.List if !$r and @buckets[0].key eq '-'; @l...
http://rosettacode.org/wiki/Sorting_algorithms/Quicksort
Sorting algorithms/Quicksort
Sorting Algorithm This is a sorting algorithm.   It may be applied to a set of data in order to sort it.     For comparing various sorts, see compare sorts.   For other sorting algorithms,   see sorting algorithms,   or: O(n logn) sorts Heap sort | Merge sort | Patience sort | Quick sort O(n log2n) sorts Shell Sort ...
#C
C
  #include <stdio.h>   void quicksort(int *A, int len);   int main (void) { int a[] = {4, 65, 2, -31, 0, 99, 2, 83, 782, 1}; int n = sizeof a / sizeof a[0];   int i; for (i = 0; i < n; i++) { printf("%d ", a[i]); } printf("\n");   quicksort(a, n);   for (i = 0; i < n; i++) { printf("%d ", a[i]);...
http://rosettacode.org/wiki/Sorting_algorithms/Patience_sort
Sorting algorithms/Patience sort
Sorting Algorithm This is a sorting algorithm.   It may be applied to a set of data in order to sort it.     For comparing various sorts, see compare sorts.   For other sorting algorithms,   see sorting algorithms,   or: O(n logn) sorts Heap sort | Merge sort | Patience sort | Quick sort O(n log2n) sorts Shell Sort ...
#Nim
Nim
import std/decls   func patienceSort[T](a: var openArray[T]) =   if a.len < 2: return   var piles: seq[seq[T]]   for elem in a: block processElem: for pile in piles.mitems: if pile[^1] > elem: pile.add(elem) break processElem piles.add(@[elem])   for i in 0..a.high: ...
http://rosettacode.org/wiki/Sorting_algorithms/Insertion_sort
Sorting algorithms/Insertion sort
Sorting Algorithm This is a sorting algorithm.   It may be applied to a set of data in order to sort it.     For comparing various sorts, see compare sorts.   For other sorting algorithms,   see sorting algorithms,   or: O(n logn) sorts Heap sort | Merge sort | Patience sort | Quick sort O(n log2n) sorts Shell Sort ...
#B4X
B4X
Sub InsertionSort (A() As Int) For i = 1 To A.Length - 1 Dim value As Int = A(i) Dim j As Int = i - 1 Do While j >= 0 And A(j) > value A(j + 1) = A(j) j = j - 1 Loop A(j + 1) = value Next End Sub   Sub Test Dim arr() As Int = Array As Int(34, 23, 54, 123, 543, 123) InsertionSort(arr) For Each i As ...
http://rosettacode.org/wiki/Sorting_algorithms/Permutation_sort
Sorting algorithms/Permutation sort
Sorting Algorithm This is a sorting algorithm.   It may be applied to a set of data in order to sort it.     For comparing various sorts, see compare sorts.   For other sorting algorithms,   see sorting algorithms,   or: O(n logn) sorts Heap sort | Merge sort | Patience sort | Quick sort O(n log2n) sorts Shell Sort ...
#REXX
REXX
/*REXX program sorts and displays an array using the permutation-sort method. */ call gen /*generate the array elements. */ call show 'before sort' /*show the before array elements. */ say copies('░', 75)...
http://rosettacode.org/wiki/Sorting_algorithms/Heapsort
Sorting algorithms/Heapsort
Sorting Algorithm This is a sorting algorithm.   It may be applied to a set of data in order to sort it.     For comparing various sorts, see compare sorts.   For other sorting algorithms,   see sorting algorithms,   or: O(n logn) sorts Heap sort | Merge sort | Patience sort | Quick sort O(n log2n) sorts Shell Sort ...
#ALGOL_68
ALGOL 68
#--- Swap function ---# PROC swap = (REF []INT array, INT first, INT second) VOID: ( INT temp := array[first]; array[first] := array[second]; array[second]:= temp );   #--- Heap sort Move Down ---# PROC heapmove = (REF []INT array, INT i, INT last) VOID: ( INT index := i; INT larger := (index*2);   ...