.. DO NOT EDIT.
.. THIS FILE WAS AUTOMATICALLY GENERATED BY SPHINX-GALLERY.
.. TO MAKE CHANGES, EDIT THE SOURCE PYTHON FILE:
.. "intro/matplotlib/auto_examples/exercises/plot_exercise_9.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_exercises_plot_exercise_9.py>`
        to download the full example code.

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

.. _sphx_glr_intro_matplotlib_auto_examples_exercises_plot_exercise_9.py:


Exercise 9
==========

Exercise 9 with matplotlib.

.. GENERATED FROM PYTHON SOURCE LINES 7-84



.. image-sg:: /intro/matplotlib/auto_examples/exercises/images/sphx_glr_plot_exercise_9_001.png
   :alt: plot exercise 9
   :srcset: /intro/matplotlib/auto_examples/exercises/images/sphx_glr_plot_exercise_9_001.png
   :class: sphx-glr-single-img





.. code-block:: Python


    import numpy as np
    import matplotlib.pyplot as plt

    plt.figure(figsize=(8, 5), dpi=80)
    plt.subplot(111)

    X = np.linspace(-np.pi, np.pi, 256, endpoint=True)
    C = np.cos(X)
    S = np.sin(X)

    plt.plot(X, C, color="blue", linewidth=2.5, linestyle="-", label="cosine")
    plt.plot(X, S, color="red", linewidth=2.5, linestyle="-", label="sine")

    ax = plt.gca()
    ax.spines["right"].set_color("none")
    ax.spines["top"].set_color("none")
    ax.xaxis.set_ticks_position("bottom")
    ax.spines["bottom"].set_position(("data", 0))
    ax.yaxis.set_ticks_position("left")
    ax.spines["left"].set_position(("data", 0))

    plt.xlim(X.min() * 1.1, X.max() * 1.1)
    plt.xticks(
        [-np.pi, -np.pi / 2, 0, np.pi / 2, np.pi],
        [r"$-\pi$", r"$-\pi/2$", r"$0$", r"$+\pi/2$", r"$+\pi$"],
    )

    plt.ylim(C.min() * 1.1, C.max() * 1.1)
    plt.yticks([-1, +1], [r"$-1$", r"$+1$"])

    t = 2 * np.pi / 3
    plt.plot([t, t], [0, np.cos(t)], color="blue", linewidth=1.5, linestyle="--")
    plt.scatter(
        [
            t,
        ],
        [
            np.cos(t),
        ],
        50,
        color="blue",
    )
    plt.annotate(
        r"$sin(\frac{2\pi}{3})=\frac{\sqrt{3}}{2}$",
        xy=(t, np.sin(t)),
        xycoords="data",
        xytext=(+10, +30),
        textcoords="offset points",
        fontsize=16,
        arrowprops={"arrowstyle": "->", "connectionstyle": "arc3,rad=.2"},
    )

    plt.plot([t, t], [0, np.sin(t)], color="red", linewidth=1.5, linestyle="--")
    plt.scatter(
        [
            t,
        ],
        [
            np.sin(t),
        ],
        50,
        color="red",
    )
    plt.annotate(
        r"$cos(\frac{2\pi}{3})=-\frac{1}{2}$",
        xy=(t, np.cos(t)),
        xycoords="data",
        xytext=(-90, -50),
        textcoords="offset points",
        fontsize=16,
        arrowprops={"arrowstyle": "->", "connectionstyle": "arc3,rad=.2"},
    )

    plt.legend(loc="upper left")

    plt.show()


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

   **Total running time of the script:** (0 minutes 0.099 seconds)


.. _sphx_glr_download_intro_matplotlib_auto_examples_exercises_plot_exercise_9.py:

.. only:: html

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

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

      :download:`Download Jupyter notebook: plot_exercise_9.ipynb <plot_exercise_9.ipynb>`

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

      :download:`Download Python source code: plot_exercise_9.py <plot_exercise_9.py>`

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

      :download:`Download zipped: plot_exercise_9.zip <plot_exercise_9.zip>`


.. only:: html

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

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