Hi !
Looking in the newsgroup about FFT, I think that a useful starting point could
be a Guide
about fft present in the Matworks site:
http://www.mathworks.com/matlabcentral/fileexchange/loadFile.do?objectIdV54&objectType=file
This is a script where is reported how to evaluate FFT and IFFT of simple signal
with
analytic results.
I hope this could be useful
bye
