>>> """
===========
Invert Axes
===========

You can use decreasing axes by flipping the normal order of the axis
limits
"""
... 
... import matplotlib.pyplot as plt
... import numpy as np
... 
... t = np.arange(0.01, 5.0, 0.01)
... s = np.exp(-t)
... 
... fig, ax = plt.subplots()
... 
... ax.plot(t, s)
... ax.set_xlim(5, 0)  # decreasing time
... ax.set_xlabel('decreasing time (s)')
... ax.set_ylabel('voltage (mV)')
... ax.set_title('Should be growing...')
... ax.grid(True)
... 
... plt.show()
...