PARAMETERS

<IN>  bf : Integer. Size of the blocking factor. Default equal 1.
<OUT> h  : GFT handel can be typed to one of the following derived data types: 
            1) GFT_CC  : to perform a Complex-Complex FFT and inverse.
            2) GFT_RCR : to perform a Real-Complex FFT and inverse.
            3) GFT_MRCR: to perform a multiple 1D Real-Complex FFT and inverse.
            4) GFT_MCC : to perform a multiple 1D Complex-Complex FFT and inverse.
<OUT> ierr : Optional error code. It will always return 0 in this release.

EXAMPLES

In this example, we set the size of the Blocking Factor to fit 256 elements of a vector register length.

     USE GFT
     INTEGER       :: n, m, bf
     TYPE(GFT_RCR) :: h
     ...
     bf=256
     CALL GFT_set_bf(BF=bf, FFT=h)
     n=15; m=12
     CALL GFT_set_fft(Nx=n, Ny=m, FFT=h)
     ...Perform the FFT
     CALL GFT_end_fft(FFT=h)
     ...

DISCUSSION

This routine is useful to speed 2D and 3D FFTs on vector processors.

SEE ALSO

• GFT_set_fft,
• GFT_do_fft,
• GFT_end_fft