From bug-octave-request at bevo dot che dot wisc dot edu  Fri Dec 15 10:58:52 2000
Subject: Correction to documentation for fftshift
From: Mark Smith <mesmith at utsi dot edu>
To: bug-octave at bevo dot che dot wisc dot edu
Date: Fri, 15 Dec 2000 10:58:39 -0600

This is what the documentation says.

## If V is a vector of E datas corresponding to E time samples spaced
## of Dt each, then fftshift (fft (V)) correspond to frequencies
##
## f = linspace (-E/(4*DT), (E/2-1)/(2*DT), E)
##

## I think the above calculation of frequency is incorrect. It should be
##
## for E even
## f = linspace( -fn, fn-fn/(E/2), E)
##
## for E odd
## f = linspace( -fn, fn, E)
##
## where fn is the Nyquist frequency
##
## fn = 1/(2*dt)


Mark Smith



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