MATLAB: Are FFTW library routines used for FFT in MATLAB 6.5 (R13) and later versions optimized for multiply-accumulate instructions and vector processors with AltiVec technology

fastfourierifftinverseMATLABtransform

I would like to know if FFTW library routines used for FFT in MATLAB 6.5 (R13) and later versions are optimized for multiply-accumulate instructions and vector processors with AltiVec technology.

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FFTW is not optimized for the multiply-accumulate instructions or specific processors. The version of the FFTW library used in MATLAB 6.5 (R13) and later versions has been patched by MathWorks, and you cannot replace it with your own compiled versions.

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MATLAB: Does the FFT function in MATLAB 6.5 (R13) use the FFTW library routines

The FFTW routines are a set of C library routines to compute the DFT of real and complex signals. For more information on these routines, please refer to the following URL:

http://www.fftw.org

The MATLAB FFT function does, in fact, use the FFTW routines. The three specific library routines used by the MATLAB FFT are:

 fftw_create_plan 
 fftw_one
 rfftw_one

The version of the FFTW library routines used is 2.1.3.

MATLAB: What is the ‘periodic’ sampling option in the HAMMING function used for in Signal Processing Toolbox 6.2 (R14)

This enhancement has been incorporated in Release 2006b (R2006b). For previous product releases, read below for any possible workarounds:

Documentation on the HAMMING, HANN, BLACKMAN, and FLATTOPWIN function is missing information about the 'periodic' option. Here is some additional information:

The periodic flag is useful for DFT/FFT purposes such as in spectral analysis.

Because there is an implicit periodic extension in the DFT/FFT, the periodic flag enables a signal that is windowed with a periodic window to have perfect periodic extension. When using windows for spectral analysis or other DFT/FFT purposes, the periodic option can be useful. When using windows for filter design, the symmetric flag should be used.

Please refer to the following for more information:

Harris, F., "On the use of windows for harmonic analysis with the discrete Fourier transform" Proceedings of the IEEE , vol. 66, No. 1, January 1978.

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MATLAB: Does the FFT function in MATLAB 6.5 (R13) use the FFTW library routines

MATLAB: What is the ‘periodic’ sampling option in the HAMMING function used for in Signal Processing Toolbox 6.2 (R14)

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