.. DO NOT EDIT.
.. THIS FILE WAS AUTOMATICALLY GENERATED BY SPHINX-GALLERY.
.. TO MAKE CHANGES, EDIT THE SOURCE PYTHON FILE:
.. "intro/matplotlib/auto_examples/pretty_plots/plot_contour_ext.py"
.. LINE NUMBERS ARE GIVEN BELOW.

.. only:: html

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

        :ref:`Go to the end <sphx_glr_download_intro_matplotlib_auto_examples_pretty_plots_plot_contour_ext.py>`
        to download the full example code.

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

.. _sphx_glr_intro_matplotlib_auto_examples_pretty_plots_plot_contour_ext.py:


Display the contours of a function
===================================

An example demoing how to plot the contours of a function, with
additional layout tweaks.

.. GENERATED FROM PYTHON SOURCE LINES 9-69



.. image-sg:: /intro/matplotlib/auto_examples/pretty_plots/images/sphx_glr_plot_contour_ext_001.png
   :alt: plot contour ext
   :srcset: /intro/matplotlib/auto_examples/pretty_plots/images/sphx_glr_plot_contour_ext_001.png
   :class: sphx-glr-single-img


.. rst-class:: sphx-glr-script-out

 .. code-block:: none

    /home/runner/work/scientific-python-lectures/scientific-python-lectures/intro/matplotlib/examples/pretty_plots/plot_contour_ext.py:24: UserWarning: The following kwargs were not used by contour: 'linewidth'
      C = plt.contour(X, Y, f(X, Y), 8, colors="black", linewidth=0.5)






|

.. code-block:: Python


    import numpy as np
    import matplotlib.pyplot as plt


    def f(x, y):
        return (1 - x / 2 + x**5 + y**3) * np.exp(-(x**2) - y**2)


    n = 256
    x = np.linspace(-3, 3, n)
    y = np.linspace(-3, 3, n)
    X, Y = np.meshgrid(x, y)

    plt.contourf(X, Y, f(X, Y), 8, alpha=0.75, cmap="hot")
    C = plt.contour(X, Y, f(X, Y), 8, colors="black", linewidth=0.5)
    plt.clabel(C, inline=1, fontsize=10)
    plt.xticks([])
    plt.yticks([])


    # Add a title and a box around it
    from matplotlib.patches import FancyBboxPatch

    ax = plt.gca()
    ax.add_patch(
        FancyBboxPatch(
            (-0.05, 0.87),
            width=0.66,
            height=0.165,
            clip_on=False,
            boxstyle="square,pad=0",
            zorder=3,
            facecolor="white",
            alpha=1.0,
            transform=plt.gca().transAxes,
        )
    )

    plt.text(
        -0.05,
        1.02,
        " Contour Plot: plt.contour(..)\n",
        horizontalalignment="left",
        verticalalignment="top",
        size="xx-large",
        transform=plt.gca().transAxes,
    )

    plt.text(
        -0.05,
        1.01,
        "\n\n  Draw contour lines and filled contours ",
        horizontalalignment="left",
        verticalalignment="top",
        size="large",
        transform=plt.gca().transAxes,
    )

    plt.show()


.. rst-class:: sphx-glr-timing

   **Total running time of the script:** (0 minutes 0.074 seconds)


.. _sphx_glr_download_intro_matplotlib_auto_examples_pretty_plots_plot_contour_ext.py:

.. only:: html

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

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

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

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

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

    .. container:: sphx-glr-download sphx-glr-download-zip

      :download:`Download zipped: plot_contour_ext.zip <plot_contour_ext.zip>`


.. only:: html

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

    `Gallery generated by Sphinx-Gallery <https://sphinx-gallery.github.io>`_