.. note:: :class: sphx-glr-download-link-note Click :ref:here  to download the full example code .. rst-class:: sphx-glr-example-title .. _sphx_glr_intro_matplotlib_auto_examples_exercises_plot_exercise_10.py: Exercise ========= Exercises with matplotlib. .. image:: /intro/matplotlib/auto_examples/exercises/images/sphx_glr_plot_exercise_10_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) C, S = np.cos(X), 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'$+1$']) plt.legend(loc='upper left') 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=dict(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=dict(arrowstyle="->", connectionstyle="arc3,rad=.2")) for label in ax.get_xticklabels() + ax.get_yticklabels(): label.set_fontsize(16) label.set_bbox(dict(facecolor='white', edgecolor='None', alpha=0.65 )) plt.show() **Total running time of the script:** ( 0 minutes 0.037 seconds) .. _sphx_glr_download_intro_matplotlib_auto_examples_exercises_plot_exercise_10.py: .. only :: html .. container:: sphx-glr-footer :class: sphx-glr-footer-example .. container:: sphx-glr-download :download:Download Python source code: plot_exercise_10.py  .. container:: sphx-glr-download :download:Download Jupyter notebook: plot_exercise_10.ipynb  .. only:: html .. rst-class:: sphx-glr-signature Gallery generated by Sphinx-Gallery _