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DOC: Explain gridsize in hexbin() #24193

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Oct 17, 2022
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DOC: Explain gridsize in hexbin() #24193

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26 changes: 25 additions & 1 deletion lib/matplotlib/axes/_axes.py
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Original file line number Diff line number Diff line change
Expand Up @@ -4715,7 +4715,31 @@ def hexbin(self, x, y, C=None, gridsize=100, bins=None,
the hexagons are approximately regular.

Alternatively, if a tuple (*nx*, *ny*), the number of hexagons
in the *x*-direction and the *y*-direction.
in the *x*-direction and the *y*-direction. In the
*y*-direction, counting is done along vertically aligned
hexagons, not along the zig-zag chains of hexagons; see the
following illustration.

.. plot::

import numpy
import matplotlib.pyplot as plt

np.random.seed(19680801)
n= 300
x = np.random.standard_normal(n)
y = np.random.standard_normal(n)

fig, ax = plt.subplots(figsize=(4, 4))
h = ax.hexbin(x, y, gridsize=(5, 3))
hx, hy = h.get_offsets().T
ax.plot(hx[24::3], hy[24::3], 'ro-')
ax.plot(hx[-3:], hy[-3:], 'ro-')
ax.set_title('gridsize=(5, 3)')
ax.axis('off')

To get approximately regular hexagons, choose
:math:`n_x = \\sqrt{3}\\,n_y`.

bins : 'log' or int or sequence, default: None
Discretization of the hexagon values.
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