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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 (see the :doc:`plot_9_multi_image_separate`
example for information on controlling this behaviour). 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 matplotlib.pyplot as plt
import numpy as np
# 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():
"""Plot exponential functions."""
x = np.linspace(-1, 2, N)
y = np.exp(x)
plt.figure()
plt.plot(x, y)
plt.xlabel("$x$")
plt.ylabel(r"$\exp(x)$")
plt.title("Exponential function")
plt.figure()
plt.plot(x, -np.exp(-x))
plt.xlabel("$x$")
plt.ylabel(r"$-\exp(-x)$")
plt.title("Negative exponential\nfunction")
# To avoid matplotlib text output
plt.show()
if __name__ == "__main__":
main()
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