.. _pylab_examples-psd_demo:

pylab_examples example code: psd_demo.py
========================================



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

::

    #!/usr/bin/env python
    # python
    
    from pylab import *
    
    dt = 0.01
    t = arange(0,10,dt)
    nse = randn(len(t))
    r = exp(-t/0.05)
    
    cnse = convolve(nse, r)*dt
    cnse = cnse[:len(t)]
    s = 0.1*sin(2*pi*t) + cnse
    
    subplot(211)
    plot(t,s)
    subplot(212)
    psd(s, 512, 1/dt)
    
    show()
    """
    % compare with MATLAB
    dt = 0.01;
    t = [0:dt:10];
    nse = randn(size(t));
    r = exp(-t/0.05);
    cnse = conv(nse, r)*dt;
    cnse = cnse(1:length(t));
    s = 0.1*sin(2*pi*t) + cnse;
    
    subplot(211)
    plot(t,s)
    subplot(212)
    psd(s, 512, 1/dt)
    
    """
    

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