NumericalTransferFunction:

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   Computes a numerical transfer function from the impulse response for the system. 
   The response f must be sampled at uniform time intervals. This function uses 
   an fft but effectively it is integrating  exp(-st)*f(t) dt from zero to infinity. 
   If the system is not damped, the results will be poor. For fastest results the 
   number of samples should be a power of two.

   For a demo type:

   NumericalTransferFunction

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   Form:
   [l, w] = NumericalTransferFunction( f, dT )
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   ------
   Inputs
   ------
   f              (1,n)  Impulse response
   dT             (1,1)  Time step

   -------
   Outputs
   -------
   l              (3,n)  Complex output
   w              (1,n)  Frequencies

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Children:

Common: Classes/@statespace/statespace.m
Common: Control/FResp
Common: Control/Step
Common: Graphics/NewFig
Common: Graphics/XLabelS
Common: Graphics/YLabelS