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Re: fft source [was "Very important"]

From: Joerg
Subject: Re: fft source [was "Very important"]
Date: Fri, 17 Dec 2004 19:18:49 +0100
User-agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.7) Gecko/20040616

Geraint Paul Bevan wrote:
Hash: SHA1

eman mohamed wrote:
| Hi ;
| Can you please tell me where i can find the fft.m , i need the source
| code for fft soon please , as it is very important to me .
| If you have the source code please send it to me .
| Thanks alot for your help in advance .

Firstly, you should probably use more specific titles when posting to
mailing lists. "Very important" looks like a virus-laden or spam message.

Secondly, all of the sources to Octave are available from the download
page at

If you type "which fft" at the Octave prompt, you will see that fft is a
builtin function. It is not implemented as an m-file.

There are numerous Octave files which have some part to play in the
implementation of FFT:

$ find /usr/local/src/octave/octave -name "*fft*"

All of these files can be obtained in a tarball of via CVS. See

If you look at, you will see that a call to the fourier()
function in the NDArray code occurs,

$ find /usr/local/src/octave/octave -name "*NDArray*"

However, the actual FFT itself is performed using standard libraries. If
you have the FFTW3 library installed on your system, Octave will use
that. If not, it will use FFTPACK (the code to which is contained in the
octave/libcruft directory).

if you are interested where fftw3 comes from:

here you find everything ...

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