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comparison doc/interpreter/signal.txi @ 11905:1d237a82e393 release-3-0-x

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Add explanation on what wisdom is.
author Francesco Potortì <pot@gnu.org>
date Mon, 12 Jan 2009 10:54:45 +0100
parents fd42779a8428
children 8463d1a2e544
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11904:059fadc0cbc3 11905:1d237a82e393
20 @chapter Signal Processing 20 @chapter Signal Processing
21 21
22 @DOCSTRING(detrend) 22 @DOCSTRING(detrend)
23 23
24 @DOCSTRING(fft) 24 @DOCSTRING(fft)
25
26 Octave uses the FFTW libraries to perform FFT computations. When Octave
27 starts up and initializes the FFTW libraries, they read a system wide
28 file (on a Unix system, it is typically @file{/etc/fftw/wisdom}) that
29 contains information useful to speed up FFT computations. This
30 information is called the @emph{wisdom}. The system-wide file allows
31 wisdom to be shared between all applications using the FFTW libraries.
32
33 Use the @code{fftw} function to generate and save wisdom. Using the
34 utilities provided together with the FFTW libraries
35 (@command{fftw-wisdom} on Unix systems), you can even add wisdom
36 generated by Octave to the system-wide wisdom file.
25 37
26 @DOCSTRING(fftw) 38 @DOCSTRING(fftw)
27 39
28 @DOCSTRING(ifft) 40 @DOCSTRING(ifft)
29 41