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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"

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Note

Click <a class="reference internal" href="#sphx-glr-download-gallery-frontpage-contour-py">here</a> to download the full example code

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<h1>Frontpage contour example<a class="headerlink" href="#frontpage-contour-example" title="Permalink to this headline">¶</a></h1>

This example reproduces the frontpage contour example.

<div class="highlight-python notranslate"><div class="highlight"><pre>import matplotlib.pyplot as plt

import numpy as np

from matplotlib import cm

extent = (-3, 3, -3, 3)

delta = 0.5

x = <a href="https://docs.scipy.org/doc/numpy/reference/generated/numpy.arange.html#numpy.arange" title="View documentation for numpy.arange">np.arange</a>(-3.0, 4.001, delta)

y = <a href="https://docs.scipy.org/doc/numpy/reference/generated/numpy.arange.html#numpy.arange" title="View documentation for numpy.arange">np.arange</a>(-4.0, 3.001, delta)

X, Y = <a href="https://docs.scipy.org/doc/numpy/reference/generated/numpy.meshgrid.html#numpy.meshgrid" title="View documentation for numpy.meshgrid">np.meshgrid</a>(x, y)

Z1 = <a href="https://docs.scipy.org/doc/numpy/reference/generated/numpy.exp.html#numpy.exp" title="View documentation for numpy.exp">np.exp</a>(-X**2 - Y**2)

Z2 = <a href="https://docs.scipy.org/doc/numpy/reference/generated/numpy.exp.html#numpy.exp" title="View documentation for numpy.exp">np.exp</a>(-(X - 1)**2 - (Y - 1)**2)

Z = Z1 - Z2

norm = cm.colors.Normalize(vmax=abs(Z).max(), vmin=-abs(Z).max())

fig, ax = <a href="../../api/_as_gen/matplotlib.pyplot.subplots.html#matplotlib.pyplot.subplots" title="View documentation for matplotlib.pyplot.subplots">plt.subplots</a>()

cset1 = ax.contourf(

X, Y, Z, 40,

norm=norm)

ax.set_xlim(-2, 2)

ax.set_ylim(-2, 2)

ax.set_xticks([])

ax.set_yticks([])

fig.savefig("contour_frontpage.png", dpi=25) # results in 160x120 px image

<a href="../../api/_as_gen/matplotlib.pyplot.show.html#matplotlib.pyplot.show" title="View documentation for matplotlib.pyplot.show">plt.show</a>()

</pre></div>

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<a class="reference download internal" download="" href="../../_downloads/17da98d632b26303b8544e01ff3e8fc7/contour.py"><code class="xref download docutils literal notranslate">Download Python source code: contour.py</code></a></div>

<a class="reference download internal" download="" href="../../_downloads/a0a83459327835520c2639e629b81f2c/contour.ipynb"><code class="xref download docutils literal notranslate">Download Jupyter notebook: contour.ipynb</code></a></div>

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Keywords: matplotlib code example, codex, python plot, pyplot

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