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# Plotting the exponential function

This example demonstrates how to import a local module and how images are stacked when two plots are created in one code block. The variable `N` from the example ‘Local module’ (file `local_module.py`) is imported in the code below. Further, note that when there is only one code block in an example, the output appears before the code block.

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

    import numpy as np
    import matplotlib.pyplot as plt

    # You can use modules local to the example being run, here we import
    # N from local_module
    from local_module import N  # = 100

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

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

        plt.figure()
        plt.plot(x, -np.exp(-x))
        plt.xlabel('$x$')
        plt.ylabel('$-\exp(-x)$')
        plt.title('Negative exponential\nfunction')
        # To avoid matplotlib text output
        plt.show()

    if __name__ == '__main__':
        main()

Estimated memory usage: 9 MB

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