matplotlib/examples/units/units_sample.py at master · feisuo/matplotlib · GitHub

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"""

plot using a variety of cm vs inches conversions. The example shows

how default unit instrospection works (ax1), how various keywords can

be used to set the x and y units to override the defaults (ax2, ax3,

ax4) and how one can set the xlimits using scalars (ax3, current units

assumed) or units (conversions applied to get the numbers to current

units)

"""

from basic_units import cm, inch

import matplotlib.pyplot as plt

import numpy

cms = cm * numpy.arange(0, 10, 2)

fig = plt.figure()

ax1 = fig.add_subplot(2, 2, 1)

ax1.plot(cms, cms)

ax2 = fig.add_subplot(2, 2, 2)

ax2.plot(cms, cms, xunits=cm, yunits=inch)

ax3 = fig.add_subplot(2, 2, 3)

ax3.plot(cms, cms, xunits=inch, yunits=cm)

ax3.set_xlim(3, 6) # scalars are interpreted in current units

ax4 = fig.add_subplot(2, 2, 4)

ax4.plot(cms, cms, xunits=inch, yunits=inch)

#fig.savefig('simple_conversion_plot.png')

ax4.set_xlim(3*cm, 6*cm) # cm are converted to inches

plt.show()