.. _pylab_examples-nan_test:

pylab_examples example code: nan_test.py
========================================



.. plot:: /home/travis/build/jenshnielsen/matplotlib/doc/mpl_examples/pylab_examples/nan_test.py

::

    #!/usr/bin/env python
    """
    Example: simple line plots with NaNs inserted.
    """
    from pylab import *
    import numpy as np
    
    t = arange(0.0, 1.0 + 0.01, 0.01)
    s = cos(2*2*pi*t)
    t[41:60] = NaN
    #t[50:60] = np.inf
    
    subplot(2, 1, 1)
    plot(t, s, '-', lw=2)
    
    xlabel('time (s)')
    ylabel('voltage (mV)')
    title('A sine wave with a gap of NaNs between 0.4 and 0.6')
    grid(True)
    
    subplot(2, 1, 2)
    t[0] = NaN
    t[-1] = NaN
    plot(t, s, '-', lw=2)
    title('Also with NaN in first and last point')
    
    xlabel('time (s)')
    ylabel('more nans')
    grid(True)
    
    show()
    

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