task_url stringlengths 30 116 | task_name stringlengths 2 86 | task_description stringlengths 0 14.4k | language_url stringlengths 2 53 | language_name stringlengths 1 52 | code stringlengths 0 61.9k |
|---|---|---|---|---|---|
http://rosettacode.org/wiki/Polymorphic_copy | Polymorphic copy | An object is polymorphic when its specific type may vary.
The types a specific value may take, is called class.
It is trivial to copy an object if its type is known:
int x;
int y = x;
Here x is not polymorphic, so y is declared of same type (int) as x.
But if the specific type of x were unknown, then y could not be d... | #Oz | Oz | declare
class T from ObjectSupport.reflect
meth init
skip
end
meth name($)
'T'
end
end
class S from T
attr a
feat f
meth name($)
'S'
end
meth getA($) @a end
meth setA(V) a := V end
end
Obj = {New S init}
Copy = {Obj clone($)... |
http://rosettacode.org/wiki/Polymorphic_copy | Polymorphic copy | An object is polymorphic when its specific type may vary.
The types a specific value may take, is called class.
It is trivial to copy an object if its type is known:
int x;
int y = x;
Here x is not polymorphic, so y is declared of same type (int) as x.
But if the specific type of x were unknown, then y could not be d... | #Perl | Perl | package T;
sub new {
my $cls = shift;
bless [ @_ ], $cls
}
sub set_data {
my $self = shift;
@$self = @_;
}
sub copy {
my $self = shift;
bless [ @$self ], ref $self;
}
sub manifest {
my $self = shift;
print "type T, content: @$self\n\n";
}
package S... |
http://rosettacode.org/wiki/Polynomial_regression | Polynomial regression | Find an approximating polynomial of known degree for a given data.
Example:
For input data:
x = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10};
y = {1, 6, 17, 34, 57, 86, 121, 162, 209, 262, 321};
The approximating polynomial is:
3 x2 + 2 x + 1
Here, the polynomial's coefficients are (3, 2, 1).
This task is i... | #Java | Java | import java.util.Arrays;
import java.util.function.IntToDoubleFunction;
import java.util.stream.IntStream;
public class PolynomialRegression {
private static void polyRegression(int[] x, int[] y) {
int n = x.length;
int[] r = IntStream.range(0, n).toArray();
double xm = Arrays.stream(x).av... |
http://rosettacode.org/wiki/Power_set | Power set | A set is a collection (container) of certain values,
without any particular order, and no repeated values.
It corresponds with a finite set in mathematics.
A set can be implemented as an associative array (partial mapping)
in which the value of each key-value pair is ignored.
Given a set S, the power set (or pow... | #EchoLisp | EchoLisp |
(define (set-cons a A)
(make-set (cons a A)))
(define (power-set e)
(cond ((null? e)
(make-set (list ∅)))
(else (let [(ps (power-set (cdr e)))]
(make-set
(append ps (map set-cons (circular-list (car e)) ps)))))))
(define B (make-set ' ( 🍎 🍇 🎂 🎄 )))
(power-set B)
→ { ∅ { �... |
http://rosettacode.org/wiki/Primality_by_trial_division | Primality by trial division | Task
Write a boolean function that tells whether a given integer is prime.
Remember that 1 and all non-positive numbers are not prime.
Use trial division.
Even numbers greater than 2 may be eliminated right away.
A loop from 3 to √ n will suffice, but other loops are allowed.
Related tasks
... | #C | C | int is_prime(unsigned int n)
{
unsigned int p;
if (!(n & 1) || n < 2 ) return n == 2;
/* comparing p*p <= n can overflow */
for (p = 3; p <= n/p; p += 2)
if (!(n % p)) return 0;
return 1;
} |
http://rosettacode.org/wiki/Price_fraction | Price fraction | A friend of mine runs a pharmacy. He has a specialized function in his Dispensary application which receives a decimal value of currency and replaces it to a standard value. This value is regulated by a government department.
Task
Given a floating point value between 0.00 and 1.00, rescale according to ... | #Go | Go | package main
import "fmt"
func pf(v float64) float64 {
switch {
case v < .06:
return .10
case v < .11:
return .18
case v < .16:
return .26
case v < .21:
return .32
case v < .26:
return .38
case v < .31:
return .44
case v < .36:
... |
http://rosettacode.org/wiki/Proper_divisors | Proper divisors | The proper divisors of a positive integer N are those numbers, other than N itself, that divide N without remainder.
For N > 1 they will always include 1, but for N == 1 there are no proper divisors.
Examples
The proper divisors of 6 are 1, 2, and 3.
The proper divisors of 100 are 1, 2, 4, 5... | #Kotlin | Kotlin | // version 1.0.5-2
fun listProperDivisors(limit: Int) {
if (limit < 1) return
for(i in 1..limit) {
print(i.toString().padStart(2) + " -> ")
if (i == 1) {
println("(None)")
continue
}
(1..i/2).filter{ i % it == 0 }.forEach { print(" $it") }
printl... |
http://rosettacode.org/wiki/Probabilistic_choice | Probabilistic choice | Given a mapping between items and their required probability of occurrence, generate a million items randomly subject to the given probabilities and compare the target probability of occurrence versus the generated values.
The total of all the probabilities should equal one. (Because floating point arithmetic is invol... | #Python | Python | import random, bisect
def probchoice(items, probs):
'''\
Splits the interval 0.0-1.0 in proportion to probs
then finds where each random.random() choice lies
'''
prob_accumulator = 0
accumulator = []
for p in probs:
prob_accumulator += p
accumulator.append(prob_accumulator)
while True:
... |
http://rosettacode.org/wiki/Priority_queue | Priority queue | A priority queue is somewhat similar to a queue, with an important distinction: each item is added to a priority queue with a priority level, and will be later removed from the queue with the highest priority element first. That is, the items are (conceptually) stored in the queue in priority order instead of in insert... | #Nim | Nim | type
PriElem[T] = tuple
data: T
pri: int
PriQueue[T] = object
buf: seq[PriElem[T]]
count: int
# first element not used to simplify indices
proc initPriQueue[T](initialSize = 4): PriQueue[T] =
result.buf.newSeq(initialSize)
result.buf.setLen(1)
result.count = 0
proc add[T](q: var PriQueue... |
http://rosettacode.org/wiki/Pythagorean_triples | Pythagorean triples | A Pythagorean triple is defined as three positive integers
(
a
,
b
,
c
)
{\displaystyle (a,b,c)}
where
a
<
b
<
c
{\displaystyle a<b<c}
, and
a
2
+
b
2
=
c
2
.
{\displaystyle a^{2}+b^{2}=c^{2}.}
They are called primitive triples if
a
,
b
,
c
{\displaystyle a,b,c}
are co-prime,... | #Visual_Basic | Visual Basic | Option Explicit
Dim total As Long, prim As Long, maxPeri As Long
Public Sub NewTri(ByVal s0 As Long, ByVal s1 As Long, ByVal s2 As Long)
Dim p As Long, x1 As Long, x2 As Long
p = s0 + s1 + s2
If p <= maxPeri Then
prim = prim + 1
total = total + maxPeri \ p
x1 = s0 + s2
x2 = s... |
http://rosettacode.org/wiki/Program_termination | Program termination |
Task
Show the syntax for a complete stoppage of a program inside a conditional.
This includes all threads/processes which are part of your program.
Explain the cleanup (or lack thereof) caused by the termination (allocated memory, database connections, open files, object finalizers/destructors, run-on-exit hooks... | #Unlambda | Unlambda | `ei |
http://rosettacode.org/wiki/Program_termination | Program termination |
Task
Show the syntax for a complete stoppage of a program inside a conditional.
This includes all threads/processes which are part of your program.
Explain the cleanup (or lack thereof) caused by the termination (allocated memory, database connections, open files, object finalizers/destructors, run-on-exit hooks... | #Ursa | Ursa | stop |
http://rosettacode.org/wiki/Prime_decomposition | Prime decomposition | The prime decomposition of a number is defined as a list of prime numbers
which when all multiplied together, are equal to that number.
Example
12 = 2 × 2 × 3, so its prime decomposition is {2, 2, 3}
Task
Write a function which returns an array or collection which contains the prime decomposition of a given ... | #Ezhil | Ezhil |
## இந்த நிரல் தரப்பட்ட எண்ணின் பகாஎண் கூறுகளைக் கண்டறியும்
நிரல்பாகம் பகாஎண்ணா(எண்1)
## இந்த நிரல்பாகம் தரப்பட்ட எண் பகு எண்ணா அல்லது பகா எண்ணா என்று கண்டறிந்து சொல்லும்
## பகுஎண் என்றால் 0 திரும்பத் தரப்படும்
## பகாஎண் என்றால் 1 திரும்பத் தரப்படும்
@(எண்1 < 0) ஆனால்
## எதிர்மறை எண்களை நேராக்குதல்
... |
http://rosettacode.org/wiki/Pointers_and_references | Pointers and references |
Basic Data Operation
This is a basic data operation. It represents a fundamental action on a basic data type.
You may see other such operations in the Basic Data Operations category, or:
Integer Operations
Arithmetic |
Comparison
Boolean Operations
Bitwise |
Logical
String Operations
Concatenation |
Interpolation |... | #Perl | Perl | # start with some var definitions
my $scalar = 'aa';
my @array = ('bb', 'cc');
my %hash = ( dd => 'DD', ee => 'EE' );
# make references
my $scalarref = \$scalar;
my $arrayref = \@array;
my $hashref = \%hash; |
http://rosettacode.org/wiki/Pointers_and_references | Pointers and references |
Basic Data Operation
This is a basic data operation. It represents a fundamental action on a basic data type.
You may see other such operations in the Basic Data Operations category, or:
Integer Operations
Arithmetic |
Comparison
Boolean Operations
Bitwise |
Logical
String Operations
Concatenation |
Interpolation |... | #Phix | Phix | atom addr = allocate(8) -- (assumes 32 bit)
poke4(addr,{NULL,SOME_CONSTANT})
c_proc(xSome_External_Routine,{addr,addr+4})
?peek4s({addr,2}) -- prints {x,y}
free(addr)
|
http://rosettacode.org/wiki/Plot_coordinate_pairs | Plot coordinate pairs | Task
Plot a function represented as x, y numerical arrays.
Post the resulting image for the following input arrays (taken from Python's Example section on Time a function):
x = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9};
y = {2.7, 2.8, 31.4, 38.1, 58.0, 76.2, 100.5, 130.0, 149.... | #gnuplot | gnuplot | unset key # Only one data set, so the key is uninformative
plot '-' # '-' can be replaced with a filename, to read data from that file.
0 2.7
1 2.8
2 31.4
3 38.1
4 68.0
5 76.2
6 100.5
7 130.0
8 149.3
9 180.0
e |
http://rosettacode.org/wiki/Plot_coordinate_pairs | Plot coordinate pairs | Task
Plot a function represented as x, y numerical arrays.
Post the resulting image for the following input arrays (taken from Python's Example section on Time a function):
x = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9};
y = {2.7, 2.8, 31.4, 38.1, 58.0, 76.2, 100.5, 130.0, 149.... | #Go | Go | package main
import (
"fmt"
"log"
"os/exec"
)
var (
x = []int{0, 1, 2, 3, 4, 5, 6, 7, 8, 9}
y = []float64{2.7, 2.8, 31.4, 38.1, 58.0, 76.2, 100.5, 130.0, 149.3, 180.0}
)
func main() {
g := exec.Command("gnuplot", "-persist")
w, err := g.StdinPipe()
if err != nil {
log.Fatal(err)
}
if err =... |
http://rosettacode.org/wiki/Polymorphism | Polymorphism | Task
Create two classes Point(x,y) and Circle(x,y,r) with a polymorphic function print, accessors for (x,y,r), copy constructor, assignment and destructor and every possible default constructors
| #Ela | Ela | type Point = Point x y
instance Show Point where
show (Point x y) = "Point " ++ (show x) ++ " " ++ (show y)
instance Name Point where
getField nm (Point x y)
| nm == "x" = x
| nm == "y" = y
| else = fail "Undefined name."
isField nm _ = nm == "x" || nm == "y"
pointX = flip Point 0
pointY = Poi... |
http://rosettacode.org/wiki/Polymorphism | Polymorphism | Task
Create two classes Point(x,y) and Circle(x,y,r) with a polymorphic function print, accessors for (x,y,r), copy constructor, assignment and destructor and every possible default constructors
| #Elena | Elena | import extensions;
class Point
{
prop int X;
prop int Y;
constructor new(int x, int y)
{
X := x;
Y := y
}
constructor new()
<= new(0,0);
print() { console.printLine("Point") }
}
class Circle : Point
{
prop int R;
constructor new()
<... |
http://rosettacode.org/wiki/Poker_hand_analyser | Poker hand analyser | Task
Create a program to parse a single five card poker hand and rank it according to this list of poker hands.
A poker hand is specified as a space separated list of five playing cards.
Each input card has two characters indicating face and suit.
Example
2d (two of diamonds).
Faces are: a, 2, 3, 4,... | #Julia | Julia | sorteddeck = [string(r) * s for s in "♣♦♥♠", r in "23456789TJQKA"]
cardlessthan(card1, card2) = indexin(x, sorteddeck)[1] < indexin(y, sorteddeck)[1]
decksort(d) = sort(d, lt=cardlessthan)
highestrank(d) = string(highestcard(d)[1])
function hasduplicate(d)
s = sort(d)
for i in 1:length(s)-1
if s... |
http://rosettacode.org/wiki/Population_count | Population count | Population count
You are encouraged to solve this task according to the task description, using any language you may know.
The population count is the number of 1s (ones) in the binary representation of a non-negative integer.
Population count is also known as:
pop count
popcount
sideways sum
... | #COBOL | COBOL | IDENTIFICATION DIVISION.
PROGRAM-ID. HAMMING.
DATA DIVISION.
WORKING-STORAGE SECTION.
01 POPCOUNT-VARIABLES.
03 POPCOUNT-IN PIC 9(15)V9.
03 FILLER REDEFINES POPCOUNT-IN.
05 POPCOUNT-REST PIC 9(15).
05 FILLER PI... |
http://rosettacode.org/wiki/Polynomial_long_division | Polynomial long division |
This page uses content from Wikipedia. The original article was at Polynomial long division. The list of authors can be seen in the page history. As with Rosetta Code, the text of Wikipedia is available under the GNU FDL. (See links for details on variance)
In algebra, polynomial long division is an algorithm for d... | #J | J | divmod=:[: (}: ; {:) ([ (] -/@,:&}. (* {:)) ] , %&{.~)^:(>:@-~&#)&.|.~ |
http://rosettacode.org/wiki/Polymorphic_copy | Polymorphic copy | An object is polymorphic when its specific type may vary.
The types a specific value may take, is called class.
It is trivial to copy an object if its type is known:
int x;
int y = x;
Here x is not polymorphic, so y is declared of same type (int) as x.
But if the specific type of x were unknown, then y could not be d... | #Phix | Phix | with javascript_semantics
enum NAME, METHOD
procedure me_t()
puts(1,"I is a T\n")
end procedure
procedure me_s()
puts(1,"I is an S\n")
end procedure
type T(object o)
-- as o[METHOD] can be overidden, don't verify it (as in test for me_t)!
return sequence(o) and length(o)=2 and string(o[NAME]) and int... |
http://rosettacode.org/wiki/Polymorphic_copy | Polymorphic copy | An object is polymorphic when its specific type may vary.
The types a specific value may take, is called class.
It is trivial to copy an object if its type is known:
int x;
int y = x;
Here x is not polymorphic, so y is declared of same type (int) as x.
But if the specific type of x were unknown, then y could not be d... | #PHP | PHP | <?php
class T {
function name() { return "T"; }
}
class S {
function name() { return "S"; }
}
$obj1 = new T();
$obj2 = new S();
$obj3 = clone $obj1;
$obj4 = clone $obj2;
echo $obj3->name(), "\n"; // prints "T"
echo $obj4->name(), "\n"; // prints "S"
?> |
http://rosettacode.org/wiki/Polynomial_regression | Polynomial regression | Find an approximating polynomial of known degree for a given data.
Example:
For input data:
x = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10};
y = {1, 6, 17, 34, 57, 86, 121, 162, 209, 262, 321};
The approximating polynomial is:
3 x2 + 2 x + 1
Here, the polynomial's coefficients are (3, 2, 1).
This task is i... | #Julia | Julia | polyfit(x::Vector, y::Vector, deg::Int) = collect(v ^ p for v in x, p in 0:deg) \ y
x = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10]
y = [1, 6, 17, 34, 57, 86, 121, 162, 209, 262, 321]
@show polyfit(x, y, 2) |
http://rosettacode.org/wiki/Power_set | Power set | A set is a collection (container) of certain values,
without any particular order, and no repeated values.
It corresponds with a finite set in mathematics.
A set can be implemented as an associative array (partial mapping)
in which the value of each key-value pair is ignored.
Given a set S, the power set (or pow... | #Elixir | Elixir | defmodule RC do
use Bitwise
def powerset1(list) do
n = length(list)
max = round(:math.pow(2,n))
for i <- 0..max-1, do: (for pos <- 0..n-1, band(i, bsl(1, pos)) != 0, do: Enum.at(list, pos) )
end
def powerset2([]), do: [[]]
def powerset2([h|t]) do
pt = powerset2(t)
(for x <- pt, do: [h|x]... |
http://rosettacode.org/wiki/Primality_by_trial_division | Primality by trial division | Task
Write a boolean function that tells whether a given integer is prime.
Remember that 1 and all non-positive numbers are not prime.
Use trial division.
Even numbers greater than 2 may be eliminated right away.
A loop from 3 to √ n will suffice, but other loops are allowed.
Related tasks
... | #C.23 | C# | static bool isPrime(int n)
{
if (n <= 1) return false;
for (int i = 2; i * i <= n; i++)
if (n % i == 0) return false;
return true;
} |
http://rosettacode.org/wiki/Price_fraction | Price fraction | A friend of mine runs a pharmacy. He has a specialized function in his Dispensary application which receives a decimal value of currency and replaces it to a standard value. This value is regulated by a government department.
Task
Given a floating point value between 0.00 and 1.00, rescale according to ... | #Groovy | Groovy | def priceFraction(value) {
assert value >= 0.0 && value <= 1.0
def priceMappings = [(0.06): 0.10, (0.11): 0.18, (0.16): 0.26, (0.21): 0.32, (0.26): 0.38,
(0.31): 0.44, (0.36): 0.50, (0.41): 0.54, (0.46): 0.58, (0.51): 0.62,
(0.56): 0.66, (0.61): 0.70, (0.66): 0.74, (0.71): 0.78, (0.76): 0.82... |
http://rosettacode.org/wiki/Proper_divisors | Proper divisors | The proper divisors of a positive integer N are those numbers, other than N itself, that divide N without remainder.
For N > 1 they will always include 1, but for N == 1 there are no proper divisors.
Examples
The proper divisors of 6 are 1, 2, and 3.
The proper divisors of 100 are 1, 2, 4, 5... | #Lua | Lua | -- Return a table of the proper divisors of n
function propDivs (n)
if n < 2 then return {} end
local divs, sqr = {1}, math.sqrt(n)
for d = 2, sqr do
if n % d == 0 then
table.insert(divs, d)
if d ~= sqr then table.insert(divs, n/d) end
end
end
table.sort(divs)... |
http://rosettacode.org/wiki/Probabilistic_choice | Probabilistic choice | Given a mapping between items and their required probability of occurrence, generate a million items randomly subject to the given probabilities and compare the target probability of occurrence versus the generated values.
The total of all the probabilities should equal one. (Because floating point arithmetic is invol... | #Quackery | Quackery | [ $ "bigrat.qky" loadfile ] now!
( --------------- zen object orientation -------------- )
[ immovable
]this[ swap do ]done[ ] is object ( [ --> )
[ ]'[ ] is method ( --> [ )
[ method
[ dup share
swap put ] ] is localise ( --> )
... |
http://rosettacode.org/wiki/Probabilistic_choice | Probabilistic choice | Given a mapping between items and their required probability of occurrence, generate a million items randomly subject to the given probabilities and compare the target probability of occurrence versus the generated values.
The total of all the probabilities should equal one. (Because floating point arithmetic is invol... | #R | R | prob = c(aleph=1/5, beth=1/6, gimel=1/7, daleth=1/8, he=1/9, waw=1/10, zayin=1/11, heth=1759/27720)
# Note that R doesn't actually require the weights
# vector for rmultinom to sum to 1.
hebrew = c(rmultinom(1, 1e6, prob))
d = data.frame(
Requested = prob,
Obtained = hebrew/sum(hebrew))
print(d) |
http://rosettacode.org/wiki/Priority_queue | Priority queue | A priority queue is somewhat similar to a queue, with an important distinction: each item is added to a priority queue with a priority level, and will be later removed from the queue with the highest priority element first. That is, the items are (conceptually) stored in the queue in priority order instead of in insert... | #Objective-C | Objective-C | #import <Foundation/Foundation.h>
const void *PQRetain(CFAllocatorRef allocator, const void *ptr) {
return (__bridge_retained const void *)(__bridge id)ptr;
}
void PQRelease(CFAllocatorRef allocator, const void *ptr) {
(void)(__bridge_transfer id)ptr;
}
CFComparisonResult PQCompare(const void *ptr1, const void *p... |
http://rosettacode.org/wiki/Pythagorean_triples | Pythagorean triples | A Pythagorean triple is defined as three positive integers
(
a
,
b
,
c
)
{\displaystyle (a,b,c)}
where
a
<
b
<
c
{\displaystyle a<b<c}
, and
a
2
+
b
2
=
c
2
.
{\displaystyle a^{2}+b^{2}=c^{2}.}
They are called primitive triples if
a
,
b
,
c
{\displaystyle a,b,c}
are co-prime,... | #Wren | Wren | var sc = System.clock
var total = 0
var prim = 0
var maxPeri = 0
var newTri // recursive function so needs to be declared before it can be called
newTri = Fn.new { |s0, s1, s2|
var p = s0 + s1 + s2
if (p <= maxPeri) {
prim = prim + 1
total = total + (maxPeri/p).floor
newTri.call( 1*s0-... |
http://rosettacode.org/wiki/Program_termination | Program termination |
Task
Show the syntax for a complete stoppage of a program inside a conditional.
This includes all threads/processes which are part of your program.
Explain the cleanup (or lack thereof) caused by the termination (allocated memory, database connections, open files, object finalizers/destructors, run-on-exit hooks... | #VBA | VBA | 'In case of problem this will terminate the program (without cleanup):
If problem then End
'As VBA is run within an application, such as Excel, a more rigorous way would be:
If problem then Application.Quit
'This will stop the application, but will prompt you to save work. |
http://rosettacode.org/wiki/Program_termination | Program termination |
Task
Show the syntax for a complete stoppage of a program inside a conditional.
This includes all threads/processes which are part of your program.
Explain the cleanup (or lack thereof) caused by the termination (allocated memory, database connections, open files, object finalizers/destructors, run-on-exit hooks... | #VBScript | VBScript | dim i, j
j = 0
do
for i = 1 to 100
while j < i
if i = 3 then
wscript.quit
end if
wend
next
loop |
http://rosettacode.org/wiki/Prime_decomposition | Prime decomposition | The prime decomposition of a number is defined as a list of prime numbers
which when all multiplied together, are equal to that number.
Example
12 = 2 × 2 × 3, so its prime decomposition is {2, 2, 3}
Task
Write a function which returns an array or collection which contains the prime decomposition of a given ... | #F.23 | F# | let decompose_prime n =
let rec loop c p =
if c < (p * p) then [c]
elif c % p = 0I then p :: (loop (c/p) p)
else loop c (p + 1I)
loop n 2I
printfn "%A" (decompose_prime 600851475143I) |
http://rosettacode.org/wiki/Pointers_and_references | Pointers and references |
Basic Data Operation
This is a basic data operation. It represents a fundamental action on a basic data type.
You may see other such operations in the Basic Data Operations category, or:
Integer Operations
Arithmetic |
Comparison
Boolean Operations
Bitwise |
Logical
String Operations
Concatenation |
Interpolation |... | #PHP | PHP | <?php
/* Assignment of scalar variables */
$a = 1;
$b =& $a; // $b and $a are now linked together
$b = 2; //both $b and $a now equal 2
$c = $b;
$c = 7; //$c is not a reference; no change to $a or $b
unset($a); //won't unset $b, just $a.
/* Passing by Reference in and out of functions */
function &pass_out() {
glo... |
http://rosettacode.org/wiki/Pointers_and_references | Pointers and references |
Basic Data Operation
This is a basic data operation. It represents a fundamental action on a basic data type.
You may see other such operations in the Basic Data Operations category, or:
Integer Operations
Arithmetic |
Comparison
Boolean Operations
Bitwise |
Logical
String Operations
Concatenation |
Interpolation |... | #PicoLisp | PicoLisp | : (setq L (1 a 2 b 3 c)) # Create a list of 6 items in 'L'
-> (1 a 2 b 3 c)
: (nth L 4) # Get a pointer to the 4th item
-> (b 3 c)
: (set (nth L 4) "Hello") # Store "Hello" in that location
-> "Hello"
: L # Look at the modified list in 'L'
-> (1 a 2... |
http://rosettacode.org/wiki/Plot_coordinate_pairs | Plot coordinate pairs | Task
Plot a function represented as x, y numerical arrays.
Post the resulting image for the following input arrays (taken from Python's Example section on Time a function):
x = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9};
y = {2.7, 2.8, 31.4, 38.1, 58.0, 76.2, 100.5, 130.0, 149.... | #Groovy | Groovy | import groovy.swing.SwingBuilder
import javax.swing.JFrame
import org.jfree.chart.ChartFactory
import org.jfree.chart.ChartPanel
import org.jfree.data.xy.XYSeries
import org.jfree.data.xy.XYSeriesCollection
import org.jfree.chart.plot.PlotOrientation
def chart = {
x = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]
y = [2.7, ... |
http://rosettacode.org/wiki/Polymorphism | Polymorphism | Task
Create two classes Point(x,y) and Circle(x,y,r) with a polymorphic function print, accessors for (x,y,r), copy constructor, assignment and destructor and every possible default constructors
| #F.23 | F# | type Printable =
abstract member Print : unit -> unit
type Point(?x, ?y) =
member t.x = defaultArg x 0.0
member t.y = defaultArg y 0.0
interface Printable with
member t.Print() = printfn "Point(x:%f, y:%f)" t.x t.y
type Circle(?center, ?radius) =
member t.center = defaultArg center (new Point())
me... |
http://rosettacode.org/wiki/Poker_hand_analyser | Poker hand analyser | Task
Create a program to parse a single five card poker hand and rank it according to this list of poker hands.
A poker hand is specified as a space separated list of five playing cards.
Each input card has two characters indicating face and suit.
Example
2d (two of diamonds).
Faces are: a, 2, 3, 4,... | #Kotlin | Kotlin | // version 1.1.2
class Card(val face: Int, val suit: Char)
const val FACES = "23456789tjqka"
const val SUITS = "shdc"
fun isStraight(cards: List<Card>): Boolean {
val sorted = cards.sortedBy { it.face }
if (sorted[0].face + 4 == sorted[4].face) return true
if (sorted[4].face == 14 && sorted[0].face ==... |
http://rosettacode.org/wiki/Population_count | Population count | Population count
You are encouraged to solve this task according to the task description, using any language you may know.
The population count is the number of 1s (ones) in the binary representation of a non-negative integer.
Population count is also known as:
pop count
popcount
sideways sum
... | #Common_Lisp | Common Lisp | (format T "3^x: ~{~a ~}~%"
(loop for i below 30
collect (logcount (expt 3 i))))
(multiple-value-bind
(evil odious)
(loop for i below 60
if (evenp (logcount i)) collect i into evil
else collect i into odious
finally (return (values evil odious)))
(format T "evil: ... |
http://rosettacode.org/wiki/Polynomial_long_division | Polynomial long division |
This page uses content from Wikipedia. The original article was at Polynomial long division. The list of authors can be seen in the page history. As with Rosetta Code, the text of Wikipedia is available under the GNU FDL. (See links for details on variance)
In algebra, polynomial long division is an algorithm for d... | #Java | Java |
import java.math.BigInteger;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
import java.util.List;
public class PolynomialLongDivision {
public static void main(String[] args) {
RunDivideTest(new Polynomial(1, 3, -12, 2, -42, 0), new Polynomial(1, 1, -3, 0));
... |
http://rosettacode.org/wiki/Polymorphic_copy | Polymorphic copy | An object is polymorphic when its specific type may vary.
The types a specific value may take, is called class.
It is trivial to copy an object if its type is known:
int x;
int y = x;
Here x is not polymorphic, so y is declared of same type (int) as x.
But if the specific type of x were unknown, then y could not be d... | #PicoLisp | PicoLisp | : (setq A (new '(+Cls1 +Cls2) 'attr1 123 'attr2 "def" 'attr3 (4 2 0) 'attr4 T))
-> $385603635
: (show A)
$385603635 (+Cls1 +Cls2)
attr4
attr3 (4 2 0)
attr2 "def"
attr1 123
-> $385603635 |
http://rosettacode.org/wiki/Polymorphic_copy | Polymorphic copy | An object is polymorphic when its specific type may vary.
The types a specific value may take, is called class.
It is trivial to copy an object if its type is known:
int x;
int y = x;
Here x is not polymorphic, so y is declared of same type (int) as x.
But if the specific type of x were unknown, then y could not be d... | #Python | Python | import copy
class T:
def classname(self):
return self.__class__.__name__
def __init__(self):
self.myValue = "I'm a T."
def speak(self):
print self.classname(), 'Hello', self.myValue
def clone(self):
return copy.copy(self)
class S1(T):
def speak(self):
print self.c... |
http://rosettacode.org/wiki/Polynomial_regression | Polynomial regression | Find an approximating polynomial of known degree for a given data.
Example:
For input data:
x = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10};
y = {1, 6, 17, 34, 57, 86, 121, 162, 209, 262, 321};
The approximating polynomial is:
3 x2 + 2 x + 1
Here, the polynomial's coefficients are (3, 2, 1).
This task is i... | #Kotlin | Kotlin | // version 1.1.51
fun polyRegression(x: IntArray, y: IntArray) {
val xm = x.average()
val ym = y.average()
val x2m = x.map { it * it }.average()
val x3m = x.map { it * it * it }.average()
val x4m = x.map { it * it * it * it }.average()
val xym = x.zip(y).map { it.first * it.second }.averag... |
http://rosettacode.org/wiki/Power_set | Power set | A set is a collection (container) of certain values,
without any particular order, and no repeated values.
It corresponds with a finite set in mathematics.
A set can be implemented as an associative array (partial mapping)
in which the value of each key-value pair is ignored.
Given a set S, the power set (or pow... | #Erlang | Erlang | For [1 2 3]:
[ ] | 0 0 0 | 0
[ 3] | 0 0 1 | 1
[ 2 ] | 0 1 0 | 2
[ 2 3] | 0 1 1 | 3
[1 ] | 1 0 0 | 4
[1 3] | 1 0 1 | 5
[1 2 ] | 1 1 0 | 6
[1 2 3] | 1 1 1 | 7
¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯
|
http://rosettacode.org/wiki/Power_set | Power set | A set is a collection (container) of certain values,
without any particular order, and no repeated values.
It corresponds with a finite set in mathematics.
A set can be implemented as an associative array (partial mapping)
in which the value of each key-value pair is ignored.
Given a set S, the power set (or pow... | #F.23 | F# |
let subsets xs = List.foldBack (fun x rest -> rest @ List.map (fun ys -> x::ys) rest) xs [[]]
|
http://rosettacode.org/wiki/Primality_by_trial_division | Primality by trial division | Task
Write a boolean function that tells whether a given integer is prime.
Remember that 1 and all non-positive numbers are not prime.
Use trial division.
Even numbers greater than 2 may be eliminated right away.
A loop from 3 to √ n will suffice, but other loops are allowed.
Related tasks
... | #C.2B.2B | C++ | #include <cmath>
bool is_prime(unsigned int n)
{
if (n <= 1)
return false;
if (n == 2)
return true;
for (unsigned int i = 2; i <= sqrt(n); ++i)
if (n % i == 0)
return false;
return true;
} |
http://rosettacode.org/wiki/Price_fraction | Price fraction | A friend of mine runs a pharmacy. He has a specialized function in his Dispensary application which receives a decimal value of currency and replaces it to a standard value. This value is regulated by a government department.
Task
Given a floating point value between 0.00 and 1.00, rescale according to ... | #Haskell | Haskell | price_fraction n
| n < 0 || n > 1 = error "Values must be between 0 and 1."
| n < 0.06 = 0.10
| n < 0.11 = 0.18
| n < 0.16 = 0.26
| n < 0.21 = 0.32
| n < 0.26 = 0.38
| n < 0.31 = 0.44
| n < 0.36 = 0.50
| n < 0.41 = 0.54
| n < 0.46 = 0.58
| n < 0.51 = 0.62
| n < 0.56 = 0.66
| n < 0.61 = 0.70
... |
http://rosettacode.org/wiki/Proper_divisors | Proper divisors | The proper divisors of a positive integer N are those numbers, other than N itself, that divide N without remainder.
For N > 1 they will always include 1, but for N == 1 there are no proper divisors.
Examples
The proper divisors of 6 are 1, 2, and 3.
The proper divisors of 100 are 1, 2, 4, 5... | #Mathematica_.2F_Wolfram_Language | Mathematica / Wolfram Language | ProperDivisors[n_Integer /; n > 0] := Most@Divisors@n; |
http://rosettacode.org/wiki/Probabilistic_choice | Probabilistic choice | Given a mapping between items and their required probability of occurrence, generate a million items randomly subject to the given probabilities and compare the target probability of occurrence versus the generated values.
The total of all the probabilities should equal one. (Because floating point arithmetic is invol... | #Racket | Racket | #lang racket
;;; returns a probabalistic choice from the sequence choices
;;; choices generates two values -- the chosen value and a
;;; probability (weight) of the choice.
;;;
;;; Note that a hash where keys are choices and values are probabilities
;;; is such a sequence.
;;;
;;; if the total probability < 1 then choi... |
http://rosettacode.org/wiki/Probabilistic_choice | Probabilistic choice | Given a mapping between items and their required probability of occurrence, generate a million items randomly subject to the given probabilities and compare the target probability of occurrence versus the generated values.
The total of all the probabilities should equal one. (Because floating point arithmetic is invol... | #Raku | Raku | constant TRIALS = 1e6;
constant @event = <aleph beth gimel daleth he waw zayin heth>;
constant @P = flat (1 X/ 5 .. 11), 1759/27720;
constant @cP = [\+] @P;
my atomicint @results[+@event];
(^TRIALS).race.map: { @results[ @cP.first: { $_ > once rand }, :k ]⚛++; }
say 'Event Occurred Expected Difference';
fo... |
http://rosettacode.org/wiki/Priority_queue | Priority queue | A priority queue is somewhat similar to a queue, with an important distinction: each item is added to a priority queue with a priority level, and will be later removed from the queue with the highest priority element first. That is, the items are (conceptually) stored in the queue in priority order instead of in insert... | #OCaml | OCaml | module PQ = Base.PriorityQueue
let () =
let tasks = [
3, "Clear drains";
4, "Feed cat";
5, "Make tea";
1, "Solve RC tasks";
2, "Tax return";
] in
let pq = PQ.make (fun (prio1, _) (prio2, _) -> prio1 > prio2) in
List.iter (PQ.add pq) tasks;
while not (PQ.is_empty pq) do
let _, task = ... |
http://rosettacode.org/wiki/Pythagorean_triples | Pythagorean triples | A Pythagorean triple is defined as three positive integers
(
a
,
b
,
c
)
{\displaystyle (a,b,c)}
where
a
<
b
<
c
{\displaystyle a<b<c}
, and
a
2
+
b
2
=
c
2
.
{\displaystyle a^{2}+b^{2}=c^{2}.}
They are called primitive triples if
a
,
b
,
c
{\displaystyle a,b,c}
are co-prime,... | #XPL0 | XPL0 | func GCD(N, D); \Return the greatest common divisor of N and D
int N, D, R; \numerator and denominator
[if D > N then
[R:=D; D:=N; N:=R];
while D > 0 do
[R:= rem(N/D);
N:= D;
D:= R;
];
return N;
];
int Max, PrimCnt, TripCnt, M, N, A, B, C, K, Prim;
[Max:= 10;
repeat PrimCnt:= 0; TripCnt:= 0... |
http://rosettacode.org/wiki/Program_termination | Program termination |
Task
Show the syntax for a complete stoppage of a program inside a conditional.
This includes all threads/processes which are part of your program.
Explain the cleanup (or lack thereof) caused by the termination (allocated memory, database connections, open files, object finalizers/destructors, run-on-exit hooks... | #Vedit_macro_language | Vedit macro language | if (#99 == 1) { Return } // Exit current macro. Return to calling macro.
if (#99 == 2) { Break_Out() } // Stop all macro execution and return to command mode.
if (#99 == 3) { Exit } // Exit Vedit. Prompt for saving any changed files.
if (#99 == 4) { Exit(4) } // As above, but return specified va... |
http://rosettacode.org/wiki/Prime_decomposition | Prime decomposition | The prime decomposition of a number is defined as a list of prime numbers
which when all multiplied together, are equal to that number.
Example
12 = 2 × 2 × 3, so its prime decomposition is {2, 2, 3}
Task
Write a function which returns an array or collection which contains the prime decomposition of a given ... | #Factor | Factor | USING: io kernel math math.parser math.primes.factors sequences ;
27720 factors
[ number>string ] map
" " join print ; |
http://rosettacode.org/wiki/Pointers_and_references | Pointers and references |
Basic Data Operation
This is a basic data operation. It represents a fundamental action on a basic data type.
You may see other such operations in the Basic Data Operations category, or:
Integer Operations
Arithmetic |
Comparison
Boolean Operations
Bitwise |
Logical
String Operations
Concatenation |
Interpolation |... | #PL.2FI | PL/I |
dcl i fixed bin(31);
dcl p pointer;
dcl j fixed bin(31) based;
i=5;
p=addr(i);
p->j=p->j+1; /an other way to say i=i+1 */
put skip edit(i)(F(5)); /* -> 6 */
/* second form */
dcl i fixed bin(31);
dcl j fixed bin(31) based(p);
i=5;
p=addr(i);
j=j+1; /* an other way to say i=i+1 */
put skip edit(i)(F(5)); /*... |
http://rosettacode.org/wiki/Pointers_and_references | Pointers and references |
Basic Data Operation
This is a basic data operation. It represents a fundamental action on a basic data type.
You may see other such operations in the Basic Data Operations category, or:
Integer Operations
Arithmetic |
Comparison
Boolean Operations
Bitwise |
Logical
String Operations
Concatenation |
Interpolation |... | #Pop11 | Pop11 | vars vec1, vec2;
;;; Create a vector and assign (reference to) it to vec1
consvector("a", "b", "c", 3) -> vec1;
;;; Copy (reference to) vector
vec1 -> vec2;
;;; Print value of vec1
vec1 =>
;;; Change first element of vec2
"d" -> vec2(1);
;;; Print value of vec1 -- the value changes because vec1 and
;;; vec2 reference t... |
http://rosettacode.org/wiki/Plot_coordinate_pairs | Plot coordinate pairs | Task
Plot a function represented as x, y numerical arrays.
Post the resulting image for the following input arrays (taken from Python's Example section on Time a function):
x = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9};
y = {2.7, 2.8, 31.4, 38.1, 58.0, 76.2, 100.5, 130.0, 149.... | #Haskell | Haskell | import Graphics.Gnuplot.Simple
pnts = [2.7, 2.8, 31.4, 38.1, 58.0, 76.2, 100.5, 130.0, 149.3, 180.0]
doPlot = plotPathStyle [ ( Title "plotting dots" )]
(PlotStyle Points (CustomStyle [])) (zip [0..] pnts) |
http://rosettacode.org/wiki/Plot_coordinate_pairs | Plot coordinate pairs | Task
Plot a function represented as x, y numerical arrays.
Post the resulting image for the following input arrays (taken from Python's Example section on Time a function):
x = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9};
y = {2.7, 2.8, 31.4, 38.1, 58.0, 76.2, 100.5, 130.0, 149.... | #HicEst | HicEst | REAL :: n=10, x(n), y(n)
x = (0, 1, 2, 3, 4, 5, 6, 7, 8, 9)
y = (2.7, 2.8, 31.4, 38.1, 58.0, 76.2, 100.5, 130.0, 149.3, 180.0)
WINDOW(WINdowhandle=wh, Width=-300, Height=-300, X=1, TItle='Rosetta')
AXIS(WINdowhandle=wh, Title='x values', Yaxis, Title='y values')
LINE(X=x, Y=y, SymbolDiameter=2) |
http://rosettacode.org/wiki/Polymorphism | Polymorphism | Task
Create two classes Point(x,y) and Circle(x,y,r) with a polymorphic function print, accessors for (x,y,r), copy constructor, assignment and destructor and every possible default constructors
| #Factor | Factor | QUALIFIED: io ! there already is print in io
GENERIC: print ( shape -- )
TUPLE: point x y ;
C: <point> point ! shorthand constructor definition
M: point print drop "Point" io:print ;
TUPLE: circle radius x y ;
C: <circle> circle
M: circle print drop "Circle" io:print ; |
http://rosettacode.org/wiki/Polymorphism | Polymorphism | Task
Create two classes Point(x,y) and Circle(x,y,r) with a polymorphic function print, accessors for (x,y,r), copy constructor, assignment and destructor and every possible default constructors
| #Forth | Forth | include lib/memcell.4th
include 4pp/lib/foos.4pp
:: Point ( xn n a--)
class
field: x \ x coordinate
field: y \ y coordinate
method: print \ print routine
method: setx \ set x... |
http://rosettacode.org/wiki/Poker_hand_analyser | Poker hand analyser | Task
Create a program to parse a single five card poker hand and rank it according to this list of poker hands.
A poker hand is specified as a space separated list of five playing cards.
Each input card has two characters indicating face and suit.
Example
2d (two of diamonds).
Faces are: a, 2, 3, 4,... | #Lua | Lua | -- Check whether t is a valid poker hand
function valid (t)
if #t ~= 5 then return false end
for k, v in pairs(t) do
for key, card in pairs(t) do
if v.value == card.value and
v.suit == card.suit and
k ~= key
then
return false
... |
http://rosettacode.org/wiki/Population_count | Population count | Population count
You are encouraged to solve this task according to the task description, using any language you may know.
The population count is the number of 1s (ones) in the binary representation of a non-negative integer.
Population count is also known as:
pop count
popcount
sideways sum
... | #Crystal | Crystal | struct Int
def evil?
self >= 0 && popcount.even?
end
end
puts "Powers of 3:", (0...30).map{|n| (3u64 ** n).popcount}.join(' ') # can also use &** (to prevent arithmetic overflow)
puts "Evil:" , 0.step.select(&.evil?).first(30).join(' ')
puts "Odious:", 0.step.reject(&.evil?).first(30).join(' ') |
http://rosettacode.org/wiki/Polynomial_long_division | Polynomial long division |
This page uses content from Wikipedia. The original article was at Polynomial long division. The list of authors can be seen in the page history. As with Rosetta Code, the text of Wikipedia is available under the GNU FDL. (See links for details on variance)
In algebra, polynomial long division is an algorithm for d... | #Julia | Julia |
using Polynomials
p = Poly([-42,0,-12,1])
q = Poly([-3,1])
d, r = divrem(p,q)
println(p, " divided by ", q, " is ", d, " with remainder ", r, ".")
|
http://rosettacode.org/wiki/Polymorphic_copy | Polymorphic copy | An object is polymorphic when its specific type may vary.
The types a specific value may take, is called class.
It is trivial to copy an object if its type is known:
int x;
int y = x;
Here x is not polymorphic, so y is declared of same type (int) as x.
But if the specific type of x were unknown, then y could not be d... | #Racket | Racket | #lang racket/base
(define (copy-prefab-struct str)
(apply make-prefab-struct (vector->list (struct->vector str))))
(struct point (x y) #:prefab)
(struct point/color point (color) #:prefab)
(let* ([original (point 0 0)]
[copied (copy-prefab-struct original)])
(displayln copied)
(displayln (eq? origi... |
http://rosettacode.org/wiki/Polymorphic_copy | Polymorphic copy | An object is polymorphic when its specific type may vary.
The types a specific value may take, is called class.
It is trivial to copy an object if its type is known:
int x;
int y = x;
Here x is not polymorphic, so y is declared of same type (int) as x.
But if the specific type of x were unknown, then y could not be d... | #Raku | Raku | my Cool $x = 22/7 but role Fink { method brag { say "I'm a cool {self.WHAT.raku}!" }}
my Cool $y = $x.clone;
$y.brag; |
http://rosettacode.org/wiki/Polymorphic_copy | Polymorphic copy | An object is polymorphic when its specific type may vary.
The types a specific value may take, is called class.
It is trivial to copy an object if its type is known:
int x;
int y = x;
Here x is not polymorphic, so y is declared of same type (int) as x.
But if the specific type of x were unknown, then y could not be d... | #REXX | REXX | /*REXX program to copy (polymorphically) one variable's value into another variable. */
b= 'old value.'
a= 123.45
b= a /*copy a variable's value into another.*/
if a==b then say "copy did work."
else say "copy didn't work." /*didn't work, maybe ran out... |
http://rosettacode.org/wiki/Polynomial_regression | Polynomial regression | Find an approximating polynomial of known degree for a given data.
Example:
For input data:
x = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10};
y = {1, 6, 17, 34, 57, 86, 121, 162, 209, 262, 321};
The approximating polynomial is:
3 x2 + 2 x + 1
Here, the polynomial's coefficients are (3, 2, 1).
This task is i... | #Lua | Lua | function eval(a,b,c,x)
return a + (b + c * x) * x
end
function regression(xa,ya)
local n = #xa
local xm = 0.0
local ym = 0.0
local x2m = 0.0
local x3m = 0.0
local x4m = 0.0
local xym = 0.0
local x2ym = 0.0
for i=1,n do
xm = xm + xa[i]
ym = ym + ya[i]
... |
http://rosettacode.org/wiki/Power_set | Power set | A set is a collection (container) of certain values,
without any particular order, and no repeated values.
It corresponds with a finite set in mathematics.
A set can be implemented as an associative array (partial mapping)
in which the value of each key-value pair is ignored.
Given a set S, the power set (or pow... | #Factor | Factor | USING: kernel prettyprint sequences arrays sets hash-sets ;
IN: powerset
: add ( set elt -- newset ) 1array <hash-set> union ;
: powerset ( set -- newset ) members { HS{ } } [ dupd [ add ] curry map append ] reduce <hash-set> ; |
http://rosettacode.org/wiki/Primality_by_trial_division | Primality by trial division | Task
Write a boolean function that tells whether a given integer is prime.
Remember that 1 and all non-positive numbers are not prime.
Use trial division.
Even numbers greater than 2 may be eliminated right away.
A loop from 3 to √ n will suffice, but other loops are allowed.
Related tasks
... | #Chapel | Chapel | proc is_prime(n)
{
if n == 2 then
return true;
if n <= 1 || n % 2 == 0 then
return false;
for i in 3..floor(sqrt(n)):int by 2 do
if n % i == 0 then
return false;
return true;
} |
http://rosettacode.org/wiki/Price_fraction | Price fraction | A friend of mine runs a pharmacy. He has a specialized function in his Dispensary application which receives a decimal value of currency and replaces it to a standard value. This value is regulated by a government department.
Task
Given a floating point value between 0.00 and 1.00, rescale according to ... | #HicEst | HicEst | DIMENSION upperbound(20), rescaleTo(20), temp(20)
upperbound = (.06,.11,.16,.21,.26,.31,.36,.41,.46,.51,.56,.61,.66,.71,.76,.81,.86,.91,.96,1.01)
rescaleTo = (.10,.18,.26,.32,.38,.44,.50,.54,.58,.62,.66,.70,.74,.78,.82,.86,.90,.94,.98,1.00)
DO test = 1, 10
value = RAN(0.5, 0.5)
temp = value > upperbound
PriceF... |
http://rosettacode.org/wiki/Proper_divisors | Proper divisors | The proper divisors of a positive integer N are those numbers, other than N itself, that divide N without remainder.
For N > 1 they will always include 1, but for N == 1 there are no proper divisors.
Examples
The proper divisors of 6 are 1, 2, and 3.
The proper divisors of 100 are 1, 2, 4, 5... | #MATLAB | MATLAB | function D=pd(N)
K=1:ceil(N/2);
D=K(~(rem(N, K))); |
http://rosettacode.org/wiki/Probabilistic_choice | Probabilistic choice | Given a mapping between items and their required probability of occurrence, generate a million items randomly subject to the given probabilities and compare the target probability of occurrence versus the generated values.
The total of all the probabilities should equal one. (Because floating point arithmetic is invol... | #ReScript | ReScript | let p = [
("Aleph", 1.0 /. 5.0),
("Beth", 1.0 /. 6.0),
("Gimel", 1.0 /. 7.0),
("Daleth", 1.0 /. 8.0),
("He", 1.0 /. 9.0),
("Waw", 1.0 /. 10.0),
("Zayin", 1.0 /. 11.0),
("Heth", 1759.0 /. 27720.0),
]
let prob_take = (arr, k) => {
let rec aux = (i, k) => {
let ... |
http://rosettacode.org/wiki/Probabilistic_choice | Probabilistic choice | Given a mapping between items and their required probability of occurrence, generate a million items randomly subject to the given probabilities and compare the target probability of occurrence versus the generated values.
The total of all the probabilities should equal one. (Because floating point arithmetic is invol... | #REXX | REXX | /*REXX program displays results of probabilistic choices, gen random #s per probability.*/
parse arg trials digs seed . /*obtain the optional arguments from CL*/
if trials=='' | trials=="," then trials= +1e6 /*Not specified? Then use the default.*/
if digs=='' | digs=="," then digs= 15 ... |
http://rosettacode.org/wiki/Priority_queue | Priority queue | A priority queue is somewhat similar to a queue, with an important distinction: each item is added to a priority queue with a priority level, and will be later removed from the queue with the highest priority element first. That is, the items are (conceptually) stored in the queue in priority order instead of in insert... | #OxygenBasic | OxygenBasic |
'PRIORITY QUEUE WITH 16 LEVELS
uses console
% pl 16 'priority levels
===================
Class PriorityQueue
===================
indexbase 1
bstring buf[pl] 'buffers to hold priority queues content
int bg[pl] 'buffers base offset
int i[pl] 'indexers
int le[pl] 'length of buffer
method constr... |
http://rosettacode.org/wiki/Pythagorean_triples | Pythagorean triples | A Pythagorean triple is defined as three positive integers
(
a
,
b
,
c
)
{\displaystyle (a,b,c)}
where
a
<
b
<
c
{\displaystyle a<b<c}
, and
a
2
+
b
2
=
c
2
.
{\displaystyle a^{2}+b^{2}=c^{2}.}
They are called primitive triples if
a
,
b
,
c
{\displaystyle a,b,c}
are co-prime,... | #zkl | zkl | fcn tri(lim,a=3,b=4,c=5){
p:=a + b + c;
if(p>lim) return(0,0);
T(1,lim/p).zipWith('+,
tri(lim, a - 2*b + 2*c, 2*a - b + 2*c, 2*a - 2*b + 3*c),
tri(lim, a + 2*b + 2*c, 2*a + b + 2*c, 2*a + 2*b + 3*c),
tri(lim, -a + 2*b + 2*c, -2*a + b + 2*c, -2*a + 2*b + 3*c)
);
} |
http://rosettacode.org/wiki/Program_termination | Program termination |
Task
Show the syntax for a complete stoppage of a program inside a conditional.
This includes all threads/processes which are part of your program.
Explain the cleanup (or lack thereof) caused by the termination (allocated memory, database connections, open files, object finalizers/destructors, run-on-exit hooks... | #Visual_Basic | Visual Basic | Sub Main()
'...
If problem Then
For n& = Forms.Count To 0 Step -1
Unload Forms(n&)
Next
Exit Sub
End If
'...
End Sub |
http://rosettacode.org/wiki/Program_termination | Program termination |
Task
Show the syntax for a complete stoppage of a program inside a conditional.
This includes all threads/processes which are part of your program.
Explain the cleanup (or lack thereof) caused by the termination (allocated memory, database connections, open files, object finalizers/destructors, run-on-exit hooks... | #Wren | Wren | import "io" for Stdin, Stdout
System.write("Do you want to terminate the program y/n ? ")
Stdout.flush()
var yn = Stdin.readLine()
if (yn == "y" || yn == "Y") {
System.print("OK, shutting down")
Fiber.suspend() // return to OS
}
System.print("OK, carrying on") |
http://rosettacode.org/wiki/Prime_decomposition | Prime decomposition | The prime decomposition of a number is defined as a list of prime numbers
which when all multiplied together, are equal to that number.
Example
12 = 2 × 2 × 3, so its prime decomposition is {2, 2, 3}
Task
Write a function which returns an array or collection which contains the prime decomposition of a given ... | #FALSE | FALSE | [2[\$@$$*@>~][\$@$@$@$@\/*=$[%$." "$@\/\0~]?~[1+1|]?]#%.]d:
27720d;! {2 2 2 3 3 5 7 11} |
http://rosettacode.org/wiki/Pointers_and_references | Pointers and references |
Basic Data Operation
This is a basic data operation. It represents a fundamental action on a basic data type.
You may see other such operations in the Basic Data Operations category, or:
Integer Operations
Arithmetic |
Comparison
Boolean Operations
Bitwise |
Logical
String Operations
Concatenation |
Interpolation |... | #PureBasic | PureBasic | Define varA.i = 5, varB.i = 0, *myInteger.Integer
*myInteger = @varA ;set pointer to address of an integer variable
varB = *myInteger\i + 3 ;set variable to the 3 + value of dereferenced pointer, i.e varB = 8 |
http://rosettacode.org/wiki/Pointers_and_references | Pointers and references |
Basic Data Operation
This is a basic data operation. It represents a fundamental action on a basic data type.
You may see other such operations in the Basic Data Operations category, or:
Integer Operations
Arithmetic |
Comparison
Boolean Operations
Bitwise |
Logical
String Operations
Concatenation |
Interpolation |... | #Python | Python | # Bind a literal string object to a name:
a = "foo"
# Bind an empty list to another name:
b = []
# Classes are "factories" for creating new objects: invoke class name as a function:
class Foo(object):
pass
c = Foo()
# Again, but with optional initialization:
class Bar(object):
def __init__(self, init... |
http://rosettacode.org/wiki/Plot_coordinate_pairs | Plot coordinate pairs | Task
Plot a function represented as x, y numerical arrays.
Post the resulting image for the following input arrays (taken from Python's Example section on Time a function):
x = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9};
y = {2.7, 2.8, 31.4, 38.1, 58.0, 76.2, 100.5, 130.0, 149.... | #Icon_and_Unicon | Icon and Unicon | link printf,numbers
procedure main()
x := [0., 1., 2., 3., 4., 5., 6., 7., 8., 9.]
y := [2.7, 2.8, 31.4, 38.1, 58.0, 76.2, 100.5, 130.0, 149.3, 180.0]
Plot(x,y,600,400)
end
$define POINTR 2 # Point Radius
$define POINTC "red" # Point Colour
$define GRIDC "grey" ... |
http://rosettacode.org/wiki/Polymorphism | Polymorphism | Task
Create two classes Point(x,y) and Circle(x,y,r) with a polymorphic function print, accessors for (x,y,r), copy constructor, assignment and destructor and every possible default constructors
| #Fortran | Fortran |
module geom
type point
real(8), private :: x = 0
real(8), private :: y = 0
contains
procedure, public :: get_x
procedure, public :: get_y
procedure, public :: set_x
procedure, public :: set_y
procedure, public :: print => print_point
procedure, pass :: copy_point
... |
http://rosettacode.org/wiki/Poker_hand_analyser | Poker hand analyser | Task
Create a program to parse a single five card poker hand and rank it according to this list of poker hands.
A poker hand is specified as a space separated list of five playing cards.
Each input card has two characters indicating face and suit.
Example
2d (two of diamonds).
Faces are: a, 2, 3, 4,... | #Nim | Nim | import algorithm, sequtils, strutils, tables, unicode
type
Suit* = enum ♠, ♥, ♦, ♣
Face* {.pure.} = enum
Ace = (1, "a")
Two = (2, "2")
Three = (3, "3")
Four = (4, "4")
Five = (5, "5")
Six = (6, "6")
Seven = (7, "7")
Eight = (8, "8")
Nine = (9, "9")
Ten = (10, "10")
Ja... |
http://rosettacode.org/wiki/Population_count | Population count | Population count
You are encouraged to solve this task according to the task description, using any language you may know.
The population count is the number of 1s (ones) in the binary representation of a non-negative integer.
Population count is also known as:
pop count
popcount
sideways sum
... | #D | D | void main() {
import std.stdio, std.algorithm, std.range, core.bitop;
enum pCount = (ulong n) => popcnt(n & uint.max) + popcnt(n >> 32);
writefln("%s\nEvil: %s\nOdious: %s",
uint.max.iota.map!(i => pCount(3L ^^ i)).take(30),
uint.max.iota.filter!(i => pCount(i) % 2 == 0).take(30)... |
http://rosettacode.org/wiki/Polynomial_long_division | Polynomial long division |
This page uses content from Wikipedia. The original article was at Polynomial long division. The list of authors can be seen in the page history. As with Rosetta Code, the text of Wikipedia is available under the GNU FDL. (See links for details on variance)
In algebra, polynomial long division is an algorithm for d... | #Kotlin | Kotlin | // version 1.1.51
typealias IAE = IllegalArgumentException
data class Solution(val quotient: DoubleArray, val remainder: DoubleArray)
fun polyDegree(p: DoubleArray): Int {
for (i in p.size - 1 downTo 0) {
if (p[i] != 0.0) return i
}
return Int.MIN_VALUE
}
fun polyShiftRight(p: DoubleArray, p... |
http://rosettacode.org/wiki/Polymorphic_copy | Polymorphic copy | An object is polymorphic when its specific type may vary.
The types a specific value may take, is called class.
It is trivial to copy an object if its type is known:
int x;
int y = x;
Here x is not polymorphic, so y is declared of same type (int) as x.
But if the specific type of x were unknown, then y could not be d... | #Ruby | Ruby | class T
def name
"T"
end
end
class S
def name
"S"
end
end
obj1 = T.new
obj2 = S.new
puts obj1.dup.name # prints "T"
puts obj2.dup.name # prints "S" |
http://rosettacode.org/wiki/Polymorphic_copy | Polymorphic copy | An object is polymorphic when its specific type may vary.
The types a specific value may take, is called class.
It is trivial to copy an object if its type is known:
int x;
int y = x;
Here x is not polymorphic, so y is declared of same type (int) as x.
But if the specific type of x were unknown, then y could not be d... | #Scala | Scala | object PolymorphicCopy {
def main(args: Array[String]) {
val a: Animal = Dog("Rover", 3, "Terrier")
val b: Animal = a.copy() // calls Dog.copy() because runtime type of 'a' is Dog
println(s"Dog 'a' = $a") // implicitly calls Dog.toString()
println(s"Dog 'b' = $b") // ditto
println(s"Dog 'a' is $... |
http://rosettacode.org/wiki/Polynomial_regression | Polynomial regression | Find an approximating polynomial of known degree for a given data.
Example:
For input data:
x = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10};
y = {1, 6, 17, 34, 57, 86, 121, 162, 209, 262, 321};
The approximating polynomial is:
3 x2 + 2 x + 1
Here, the polynomial's coefficients are (3, 2, 1).
This task is i... | #Maple | Maple | with(CurveFitting);
PolynomialInterpolation([[0, 1], [1, 6], [2, 17], [3, 34], [4, 57], [5, 86], [6, 121], [7, 162], [8, 209], [9, 262], [10, 321]], 'x');
|
http://rosettacode.org/wiki/Power_set | Power set | A set is a collection (container) of certain values,
without any particular order, and no repeated values.
It corresponds with a finite set in mathematics.
A set can be implemented as an associative array (partial mapping)
in which the value of each key-value pair is ignored.
Given a set S, the power set (or pow... | #Forth | Forth | : ?print dup 1 and if over args type space then ;
: .set begin dup while ?print >r 1+ r> 1 rshift repeat drop drop ;
: .powerset 0 do ." ( " 1 i .set ." )" cr loop ;
: check-none dup 2 < abort" Usage: powerset [val] .. [val]" ;
: check-size dup /cell 8 [*] >= abort" Set too large" ;
: powerset 1 argn check-none check-s... |
http://rosettacode.org/wiki/Primality_by_trial_division | Primality by trial division | Task
Write a boolean function that tells whether a given integer is prime.
Remember that 1 and all non-positive numbers are not prime.
Use trial division.
Even numbers greater than 2 may be eliminated right away.
A loop from 3 to √ n will suffice, but other loops are allowed.
Related tasks
... | #Clojure | Clojure | (defn divides? [k n] (zero? (mod k n))) |
http://rosettacode.org/wiki/Price_fraction | Price fraction | A friend of mine runs a pharmacy. He has a specialized function in his Dispensary application which receives a decimal value of currency and replaces it to a standard value. This value is regulated by a government department.
Task
Given a floating point value between 0.00 and 1.00, rescale according to ... | #Icon_and_Unicon | Icon and Unicon |
record Bounds(low,high,new)
# rescale given value according to a list of bounds
procedure rescale (i, bounds)
every bound := !bounds do
if bound.low <= i < bound.high
then return bound.new
return fail # could not find i in bounds
end
procedure main ()
bounds := [
Bounds(0.00, 0.06, 0.10),
... |
http://rosettacode.org/wiki/Proper_divisors | Proper divisors | The proper divisors of a positive integer N are those numbers, other than N itself, that divide N without remainder.
For N > 1 they will always include 1, but for N == 1 there are no proper divisors.
Examples
The proper divisors of 6 are 1, 2, and 3.
The proper divisors of 100 are 1, 2, 4, 5... | #Modula-2 | Modula-2 | MODULE ProperDivisors;
FROM FormatString IMPORT FormatString;
FROM Terminal IMPORT WriteString,WriteLn,ReadChar;
PROCEDURE WriteInt(n : INTEGER);
VAR buf : ARRAY[0..15] OF CHAR;
BEGIN
FormatString("%i", buf, n);
WriteString(buf)
END WriteInt;
PROCEDURE proper_divisors(n : INTEGER; print_flag : BOOLEAN) : IN... |
http://rosettacode.org/wiki/Probabilistic_choice | Probabilistic choice | Given a mapping between items and their required probability of occurrence, generate a million items randomly subject to the given probabilities and compare the target probability of occurrence versus the generated values.
The total of all the probabilities should equal one. (Because floating point arithmetic is invol... | #Ring | Ring |
# Project : Probabilistic choice
cnt = list(8)
item = ["aleph","beth","gimel","daleth","he","waw","zayin","heth"]
prob = [1/5.0, 1/6.0, 1/7.0, 1/8.0, 1/9.0, 1/10.0, 1/11.0, 1759/27720]
for trial = 1 to 1000000
r = random(10)/10
p = 0
for i = 1 to len(prob)
p = p + prob[i]
if r < p
... |
http://rosettacode.org/wiki/Probabilistic_choice | Probabilistic choice | Given a mapping between items and their required probability of occurrence, generate a million items randomly subject to the given probabilities and compare the target probability of occurrence versus the generated values.
The total of all the probabilities should equal one. (Because floating point arithmetic is invol... | #Ruby | Ruby | probabilities = {
"aleph" => 1/5.0,
"beth" => 1/6.0,
"gimel" => 1/7.0,
"daleth" => 1/8.0,
"he" => 1/9.0,
"waw" => 1/10.0,
"zayin" => 1/11.0,
}
probabilities["heth"] = 1.0 - probabilities.each_value.inject(:+)
ordered_keys = probabilities.keys
sum, sums = 0.0, {}
ordered_keys.each do |key|
... |
http://rosettacode.org/wiki/Priority_queue | Priority queue | A priority queue is somewhat similar to a queue, with an important distinction: each item is added to a priority queue with a priority level, and will be later removed from the queue with the highest priority element first. That is, the items are (conceptually) stored in the queue in priority order instead of in insert... | #Pascal | Pascal |
program PriorityQueueTest;
uses Classes;
Type
TItem = record
Priority:Integer;
Value:string;
end;
PItem = ^TItem;
TPriorityQueue = class(Tlist)
procedure Push(Priority:Integer;Value:string);
procedure SortPriority();
function Pop():String;
function Empty:Boolean;
end;
{ TPriorityQueue }
pro... |
http://rosettacode.org/wiki/Pythagorean_triples | Pythagorean triples | A Pythagorean triple is defined as three positive integers
(
a
,
b
,
c
)
{\displaystyle (a,b,c)}
where
a
<
b
<
c
{\displaystyle a<b<c}
, and
a
2
+
b
2
=
c
2
.
{\displaystyle a^{2}+b^{2}=c^{2}.}
They are called primitive triples if
a
,
b
,
c
{\displaystyle a,b,c}
are co-prime,... | #ZX_Spectrum_Basic | ZX Spectrum Basic | 1 LET Y=0: LET X=0: LET Z=0: LET V=0: LET U=0: LET L=10: LET T=0: LET P=0: LET N=4: LET M=0: PRINT "limit trip. prim."
2 FOR U=2 TO INT (SQR (L/2)): LET Y=U-INT (U/2)*2: LET N=N+4: LET M=U*U*2: IF Y=0 THEN LET M=M-U-U
3 FOR V=1+Y TO U-1 STEP 2: LET M=M+N: LET X=U: LET Y=V
4 LET Z=Y: LET Y=X-INT (X/Y)*Y:... |
http://rosettacode.org/wiki/Program_termination | Program termination |
Task
Show the syntax for a complete stoppage of a program inside a conditional.
This includes all threads/processes which are part of your program.
Explain the cleanup (or lack thereof) caused by the termination (allocated memory, database connections, open files, object finalizers/destructors, run-on-exit hooks... | #XPL0 | XPL0 | if Problem then exit 1;
|
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