
.. DO NOT EDIT.
.. THIS FILE WAS AUTOMATICALLY GENERATED BY SPHINX-GALLERY.
.. TO MAKE CHANGES, EDIT THE SOURCE PYTHON FILE:
.. "gallery/frontpage/contour.py"
.. LINE NUMBERS ARE GIVEN BELOW.

.. only:: html

    .. note::
        :class: sphx-glr-download-link-note

        Click :ref:`here <sphx_glr_download_gallery_frontpage_contour.py>`
        to download the full example code

.. rst-class:: sphx-glr-example-title

.. _sphx_glr_gallery_frontpage_contour.py:


=========================
Frontpage contour example
=========================

This example reproduces the frontpage contour example.

.. GENERATED FROM PYTHON SOURCE LINES 8-35



.. image:: /gallery/frontpage/images/sphx_glr_contour_001.png
    :alt: contour
    :class: sphx-glr-single-img





.. code-block:: default


    import matplotlib.pyplot as plt
    import numpy as np
    from matplotlib import cm

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

    delta = 0.5
    x = np.arange(-3.0, 4.001, delta)
    y = np.arange(-4.0, 3.001, delta)
    X, Y = np.meshgrid(x, y)
    Z1 = np.exp(-X**2 - Y**2)
    Z2 = np.exp(-(X - 1)**2 - (Y - 1)**2)
    Z = Z1 - Z2

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

    fig, ax = plt.subplots()
    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
    plt.show()


.. _sphx_glr_download_gallery_frontpage_contour.py:


.. only :: html

 .. container:: sphx-glr-footer
    :class: sphx-glr-footer-example



  .. container:: sphx-glr-download sphx-glr-download-python

     :download:`Download Python source code: contour.py <contour.py>`



  .. container:: sphx-glr-download sphx-glr-download-jupyter

     :download:`Download Jupyter notebook: contour.ipynb <contour.ipynb>`


.. only:: html

 .. rst-class:: sphx-glr-signature

    Keywords: matplotlib code example, codex, python plot, pyplot
    `Gallery generated by Sphinx-Gallery
    <https://sphinx-gallery.readthedocs.io>`_
