This is documentation for Mathematica 8, which was
based on an earlier version of the Wolfram Language.
 FOURIER SERIES PACKAGE SYMBOL

# NDTFourierTransform

 gives a numerical approximation to the discrete time Fourier transform of expr evaluated at the numerical value , where expr is a function of n.
• The numerical approximation to the discrete time Fourier transform of expr is by default defined to be NSum.
• Different choices for the definition of the discrete time Fourier transform can be specified using the option FourierParameters.
• With the setting FourierParameters, the discrete time Fourier transform computed by is NSum[expr - b n , {n, -, }].
• In addition to the option FourierParameters, can also accept the options available to NSum. These options are passed directly to NSum.
Different definitions for numerical approximation of a discrete time Fourier transform:
Compare with the answer from symbolic evaluation with FourierSequenceTransform:
Needs["FourierSeries`"]
Different definitions for numerical approximation of a discrete time Fourier transform:
 Out[2]=
 Out[3]=
Compare with the answer from symbolic evaluation with FourierSequenceTransform:
 Out[4]=
 Out[5]=
 Out[6]=