Step Demo

This example demonstrates the use of pyplot.step for piece-wise constant curves. In particular, it illustrates the effect of the parameter where on the step position.

The circular markers created with pyplot.plot show the actual data positions so that it's easier to see the effect of where.

import numpy as np
import matplotlib.pyplot as plt

x = np.arange(14)
y = np.sin(x / 2)

plt.step(x, y + 2, label='pre (default)')
plt.plot(x, y + 2, 'o--', color='grey', alpha=0.3)

plt.step(x, y + 1, where='mid', label='mid')
plt.plot(x, y + 1, 'o--', color='grey', alpha=0.3)

plt.step(x, y, where='post', label='post')
plt.plot(x, y, 'o--', color='grey', alpha=0.3)

plt.grid(axis='x', color='0.95')
plt.legend(title='Parameter where:')
plt.title('plt.step(where=...)')
plt.show()
../../_images/sphx_glr_step_demo_001.png

The same behavior can be achieved by using the drawstyle parameter of pyplot.plot.

plt.plot(x, y + 2, drawstyle='steps', label='steps (=steps-pre)')
plt.plot(x, y + 2, 'o--', color='grey', alpha=0.3)

plt.plot(x, y + 1, drawstyle='steps-mid', label='steps-mid')
plt.plot(x, y + 1, 'o--', color='grey', alpha=0.3)

plt.plot(x, y, drawstyle='steps-post', label='steps-post')
plt.plot(x, y, 'o--', color='grey', alpha=0.3)

plt.grid(axis='x', color='0.95')
plt.legend(title='Parameter drawstyle:')
plt.title('plt.plot(drawstyle=...)')
plt.show()
../../_images/sphx_glr_step_demo_002.png

References

The use of the following functions, methods, classes and modules is shown in this example:

import matplotlib
matplotlib.axes.Axes.step
matplotlib.pyplot.step
matplotlib.axes.Axes.plot
matplotlib.pyplot.plot

Out:

<function plot at 0x7f6ea103d670>

Keywords: matplotlib code example, codex, python plot, pyplot Gallery generated by Sphinx-Gallery