.. _pylab_examples-contour_corner_mask:

pylab_examples example code: contour_corner_mask.py
===================================================



.. plot:: /home/tcaswell/source/p/matplotlib/doc/mpl_examples/pylab_examples/contour_corner_mask.py

::

    """
    Illustrate the difference between corner_mask=False and corner_mask=True
    for masked contour plots.
    """
    import matplotlib.pyplot as plt
    import numpy as np
    
    # Data to plot.
    x, y = np.meshgrid(np.arange(7), np.arange(10))
    z = np.sin(0.5*x)*np.cos(0.52*y)
    
    # Mask various z values.
    mask = np.zeros_like(z, dtype=np.bool)
    mask[2, 3:5] = True
    mask[3:5, 4] = True
    mask[7, 2] = True
    mask[5, 0] = True
    mask[0, 6] = True
    z = np.ma.array(z, mask=mask)
    
    corner_masks = [False, True]
    for i, corner_mask in enumerate(corner_masks):
        plt.subplot(1, 2, i+1)
        cs = plt.contourf(x, y, z, corner_mask=corner_mask)
        plt.contour(cs, colors='k')
        plt.title('corner_mask = {0}'.format(corner_mask))
    
        # Plot grid.
        plt.grid(c='k', ls='-', alpha=0.3)
    
        # Indicate masked points with red circles.
        plt.plot(np.ma.array(x, mask=~mask), y, 'ro')
    
    plt.show()
    

Keywords: python, matplotlib, pylab, example, codex (see :ref:`how-to-search-examples`)