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adding auto ticks example #8879

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Jul 15, 2017
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adding auto ticks example #8879

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46 changes: 46 additions & 0 deletions examples/ticks_and_spines/auto_ticks.py
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"""
=================================
Automatically setting tick labels
=================================

Setting the behavior of tick auto-placement.

If you don't explicitly set tick positions / labels, Matplotlib will attempt
to choose them both automatically based on the displayed data and its limits.

By default, this attempts to choose tick positions that are distributed
along the axis:
"""
import matplotlib.pyplot as plt
import numpy as np
np.random.seed(19680801)

fig, ax = plt.subplots()
dots = np.arange(10) / 100. + .03
x, y = np.meshgrid(dots, dots)
data = [x.ravel(), y.ravel()]
ax.scatter(*data, c=data[1])

################################################################################
# Sometimes choosing evenly-distributed ticks results in strange tick numbers.
# If you'd like Matplotlib to keep ticks located at round numbers, you can
# change this behavior with the following rcParams value:

print(plt.rcParams['axes.autolimit_mode'])

# Now change this value and see the results
with plt.rc_context({'axes.autolimit_mode': 'round_numbers'}):
fig, ax = plt.subplots()
ax.scatter(*data, c=data[1])

################################################################################
# You can also alter the margins of the axes around the data by
# with ``axes.(x,y)margin``:

with plt.rc_context({'axes.autolimit_mode': 'round_numbers',
'axes.xmargin': .8,
'axes.ymargin': .8}):
fig, ax = plt.subplots()
ax.scatter(*data, c=data[1])

plt.show()