.. _pylab_examples-masked_demo:

pylab_examples example code: masked_demo.py
===========================================



.. plot:: /home/mdboom/Work/builds/matplotlib/doc/mpl_examples/pylab_examples/masked_demo.py

::

    #!/usr/bin/env python
    '''
    Plot lines with points masked out.
    
    This would typically be used with gappy data, to
    break the line at the data gaps.
    '''
    
    from pylab import *
    
    x = ma.arange(0, 2*pi, 0.02)
    y = ma.sin(x)
    y1 = sin(2*x)
    y2 = sin(3*x)
    ym1 = ma.masked_where(y1 > 0.5, y1)
    ym2 = ma.masked_where(y2 < -0.5, y2)
    
    lines = plot(x, y, 'r', x, ym1, 'g', x, ym2, 'bo')
    setp(lines[0], linewidth = 4)
    setp(lines[1], linewidth = 2)
    setp(lines[2], markersize = 10)
    
    legend( ('No mask', 'Masked if > 0.5', 'Masked if < -0.5') ,
            loc = 'upper right')
    title('Masked line demo')
    show()
    

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