.. _pylab_examples-streamplot_demo:

pylab_examples example code: streamplot_demo.py
===============================================



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

::

    import numpy as np
    import matplotlib.pyplot as plt
    
    Y, X = np.mgrid[-3:3:100j, -3:3:100j]
    U = -1 - X**2 + Y
    V = 1 + X - Y**2
    speed = np.sqrt(U*U + V*V)
    
    plt.streamplot(X, Y, U, V, color=U, linewidth=2, cmap=plt.cm.autumn)
    plt.colorbar()
    
    f, (ax1, ax2) = plt.subplots(ncols=2)
    ax1.streamplot(X, Y, U, V, density=[0.5, 1])
    
    lw = 5*speed/speed.max()
    ax2.streamplot(X, Y, U, V, density=0.6, color='k', linewidth=lw)
    
    plt.show()
    
    

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