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[WIP] Add tutorial for LogScale #11250

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47 changes: 47 additions & 0 deletions tutorials/intermediate/log_tutorial.py
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"""
=================
LogScale tutorial
=================
Using LogScale in matplotlib

LogScale is a class for plotting a logarithmic scale on a plot.
Care is taken to not plot negative values. LogScale provides
different transformations based on the base of the logarithm-

- base 10
- base 2
- base e
- arbitrary base

"""

import numpy as np
import matplotlib.pyplot as plt

plt.subplots_adjust(hspace=0.4)
t = np.arange(0.01, 20.0, 0.01)

# log y axis
plt.subplot(221)
plt.semilogy(t, np.exp(-t/5.0))
plt.title('semilogy')
plt.grid(True)

# log x axis
plt.subplot(222)
plt.semilogx(t, np.sin(2*np.pi*t))
plt.title('semilogx')
plt.grid(True)

# log x and y axis
plt.subplot(223)
plt.loglog(t, 20*np.exp(-t/10.0), basex=2)
plt.grid(True)
plt.title('loglog base 2 on x')

# with errorbars: clip non-positive values
ax = plt.subplot(224)
ax.set_xscale("log", nonposx='clip')
ax.set_yscale("log", nonposy='clip')

plt.show()