.. _pylab_examples-pcolor_log:

pylab_examples example code: pcolor_log.py
==========================================



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

::

    import matplotlib.pyplot as plt
    from matplotlib.colors import LogNorm
    import numpy as np
    from matplotlib.mlab import bivariate_normal
    
    
    N = 100
    X, Y = np.mgrid[-3:3:complex(0, N), -2:2:complex(0, N)]
    
    # A low hump with a spike coming out of the top right.
    # Needs to have z/colour axis on a log scale so we see both hump and spike.
    # linear scale only shows the spike.
    Z1 = bivariate_normal(X, Y, 0.1, 0.2, 1.0, 1.0) + 0.1 * bivariate_normal(X, Y, 1.0, 1.0, 0.0, 0.0)
    
    plt.subplot(2, 1, 1)
    plt.pcolor(X, Y, Z1, norm=LogNorm(vmin=Z1.min(), vmax=Z1.max()), cmap='PuBu_r')
    plt.colorbar()
    
    plt.subplot(2, 1, 2)
    plt.pcolor(X, Y, Z1, cmap='PuBu_r')
    plt.colorbar()
    
    
    plt.show()
    

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