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"""
=======
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, map(str, x))
ax.set_yscale('log')
ax.set_xlabel('x')
ax.set_ylabel('y')
plt.show()
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