Choosing the thumbnail figure

An example to demonstrate how to choose which figure is displayed as the thumbnail if the example generates more than one figure. This is done by specifying the keyword-value pair sphinx_gallery_thumbnail_number = 2 as a comment somewhere below the docstring in the example file.

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# Code source: Óscar Nájera
# License: BSD 3 clause

import numpy as np
import matplotlib.pyplot as plt


def main():
    x = np.linspace(-1, 2, 100)
    y = np.exp(x)

    plt.figure()
    plt.plot(x, y)
    plt.xlabel('$x$')
    plt.ylabel('$\exp(x)$')

    # The next line sets the thumbnail for the second figure in the gallery
    #   (plot with negative exponential in orange)
    # sphinx_gallery_thumbnail_number = 2
    plt.figure()
    plt.plot(x, -np.exp(-x), color='orange', linewidth=4)
    plt.xlabel('$x$')
    plt.ylabel('$-\exp(-x)$')

    plt.show()

if __name__ == '__main__':
    main()