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Re: A question on fftshift

From: Roberto Hernandez
Subject: Re: A question on fftshift
Date: Fri, 19 Jul 2002 16:24:52 -0300
User-agent: Mozilla/5.0 (Windows; U; Win98; en-US; rv:1.0.0) Gecko/20020530

Steve M. Robbins wrote:
is that the frequency interval for the FFT output is [-fc,fc] where fc
is the critical (Nyquist) frequency.

For an odd number of samples. Otherwise it's [-fc, fc - 1(N*Dt)].

The documentation for fftshift says otherwise, however.
Who is correct?

The documentation is wrong. This was reported, but I guess it hasn't been fixed. Search the mailing lists for "fftshift help in octave 2.1.35, incorrect?" in April of 2002.

The function works fine, it's only a documentation problem.


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