| """ | |
| ======= | |
| Log Bar | |
| ======= | |
| Plotting a bar chart with a logarithmic y-axis. | |
| """ | |
| import matplotlib.pyplot as plt | |
| import numpy as np | |
| data = ((3, 1000), (10, 3), (100, 30), (500, 800), (50, 1)) | |
| dim = len(data[0]) | |
| w = 0.75 | |
| dimw = w / dim | |
| fig, ax = plt.subplots() | |
| x = np.arange(len(data)) | |
| for i in range(len(data[0])): | |
| y = [d[i] for d in data] | |
| b = ax.bar(x + i * dimw, y, dimw, bottom=0.001) | |
| ax.set_xticks(x + dimw / 2, labels=map(str, x)) | |
| ax.set_yscale('log') | |
| ax.set_xlabel('x') | |
| ax.set_ylabel('y') | |
| plt.show() | |