.. note:: :class: sphx-glr-download-link-note Click :ref:`here ` to download the full example code .. rst-class:: sphx-glr-example-title .. _sphx_glr_gallery_lines_bars_and_markers_span_regions.py: ================ Using span_where ================ Illustrate some helper functions for shading regions where a logical mask is True. See :meth:`matplotlib.collections.BrokenBarHCollection.span_where` .. code-block:: default 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() .. image:: /gallery/lines_bars_and_markers/images/sphx_glr_span_regions_001.png :class: sphx-glr-single-img ------------ References """""""""" The use of the following functions, methods, classes and modules is shown in this example: .. code-block:: default import matplotlib matplotlib.collections.BrokenBarHCollection matplotlib.collections.BrokenBarHCollection.span_where matplotlib.axes.Axes.add_collection matplotlib.axes.Axes.axhline .. rst-class:: sphx-glr-script-out Out: .. code-block:: none .. _sphx_glr_download_gallery_lines_bars_and_markers_span_regions.py: .. only :: html .. container:: sphx-glr-footer :class: sphx-glr-footer-example .. container:: sphx-glr-download :download:`Download Python source code: span_regions.py ` .. container:: sphx-glr-download :download:`Download Jupyter notebook: span_regions.ipynb ` .. only:: html .. rst-class:: sphx-glr-signature Keywords: matplotlib code example, codex, python plot, pyplot `Gallery generated by Sphinx-Gallery `_