.. _pylab_examples-nan_test:

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



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

::

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

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