CRFFT2 man page on IRIX

CRFFT2 man page on IRIX

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CRFFT2(3F)							    CRFFT2(3F)

NAME
     CRFFT2 - Calculate a complex-to-real Fourier synthesis/analysis.

DESCRIPTION
     A subroutine that calculates a Fourier synthesis if the sign of IX is
     negative and a Fourier analysis if the sign of IX is positive.

      Call from FORTRAN:

	    CALL CRFFT2(init,ix,n,x,work,y)

	  init	<>0  Generates sine and cosine tables in WORK
		= 0  Calculates Fourier transforms using sine and
		   cosine tables of previous call.
	  ix	> 0  Calculates Fourier analysis
		<=0  Calculates Fourier synthesis.
	  n	Size of Fourier transform; 2**m where 2<=m.
	  x	Input vector.  Vector of (n/2)+1 complex values.
	  work	Working storage.  Vector of (3/2)n+2 complex values.
	  y	Result vector.	Vector of n complex values.

     For equations and other additional information, see the CRAY-1 Computer
     Systems - Library Reference Manual, SR-0014, page 4-53.

									Page 1

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