### Navigation

- index
- modules |
- home|
- examples|
- tutorials|
- pyplot|
- docs »

# Using span_where

Illustrate some helper functions for shading regions where a logical mask is True

See `matplotlib.collections.BrokenBarHCollection.span_where()`

    import numpy as np
    import matplotlib.pyplot as plt
    import matplotlib.collections as collections

    t = np.arange(0.0, 2, 0.01)
    s1 = np.sin(2*np.pi*t)
    s2 = 1.2*np.sin(4*np.pi*t)

    fig, ax = plt.subplots()
    ax.set_title('using span_where')
    ax.plot(t, s1, color='black')
    ax.axhline(0, color='black', lw=2)

    collection = collections.BrokenBarHCollection.span_where(
        t, ymin=0, ymax=1, where=s1 > 0, facecolor='green', alpha=0.5)
    ax.add_collection(collection)

    collection = collections.BrokenBarHCollection.span_where(
        t, ymin=-1, ymax=0, where=s1 < 0, facecolor='red', alpha=0.5)
    ax.add_collection(collection)

    plt.show()

Total running time of the script: ( 0 minutes 0.037 seconds)

Generated by Sphinx-Gallery