sfftm1du,dfftm1du(3F)					 sfftm1du,dfftm1du(3F)

NAME    [Toc]    [Back]

     dfftm1du, sfftm1du	- Multiple 1D, Real to Complex Fast Fourier Transform.

FORTRAN	SPECIFICATION
     subroutine	DFFTM1DU( job, n, p, sequence, inc, lda, workspace )
     integer		 job, n, p, inc, lda
     double precision	 sequence(lda,*), workspace(*)

     subroutine	SFFTM1DU( job, n, p, sequence, inc, lda, workspace )
     integer		 job, n, p, inc, lda
     real		 sequence(lda,*), workspace(*)

C SPECIFICATION    [Toc]    [Back]

     int	dfftm1du( int job, int n, int p,
			 double	*sequence, int inc, int	lda,
			 double	*workspace)

     int	sfftm1du( int job, int n, int p,
			 float	*sequence, int inc, int	lda,
			 float	*workspace)

DESCRIPTION    [Toc]    [Back]

     DFFTM1DU and SFFTM1DU compute the complex Fourier transform of P real
     periodic sequences	of N samples each.

     NOTE: These routines are provided only for	compatibility with previous
     releases of complib.

PARAMETERS    [Toc]    [Back]

     JOB - INTEGER
     On	entry specifies	whether	to perform a forward or	backward Fast Fourier
     Transform:
	 JOB = -1,  forward FFT
	 JOB =	1,  backward FFT Unchanged on exit.

     N - INTEGER.    [Toc]    [Back]
     On	entry, N specifies the number of elements in each sequence.  Unchanged
     on	exit.

     P - INTEGER.    [Toc]    [Back]
     On	entry, P specifies the number of sequences.  Unchanged on exit.

     SEQUENCE -	Array.
     Array of DIMENSION	( LDA, p ).  Array containing the (lda*p) elements for
     the FFT.  On exit,	SEQUENCE is overwritten	by its transform.






									Page 1






sfftm1du,dfftm1du(3F)					 sfftm1du,dfftm1du(3F)



     INC - INTEGER.    [Toc]    [Back]
     Increment between two consecutive elements	of the sequence.  Unchanged on
     exit.

     LDA - INTEGER.    [Toc]    [Back]
     On	entry, LDA specifies the first dimension of the	array SEQUENCE as
     declared in the calling (sub)program. LDA must be at least	max( 1,
     2*((N1+2)/2) ).  Unchanged	on exit.

     WORKSPACE - Array.    [Toc]    [Back]
     Array of dimension	at least ( N + 15  ).  Array containing	the
     Sines/Cosines and factorization of	N.  WORKSPACE needs to be initialized
     by	a call to sfftm1dui or dfftm1dui.

SEE ALSO    [Toc]    [Back]

     o32fft


									PPPPaaaaggggeeee 2222