scfftm1dui,dzfftm1dui(3F)			     scfftm1dui,dzfftm1dui(3F)

NAME    [Toc]    [Back]

     scfftm1dui, dzfftm1dui - initialize the coefficient array for real-tocomplex
 Multiple 1D FFT modules.

SYNOPSYS    [Toc]    [Back]

     FORTRAN SPECIFICATION
     subroutine	SCFFTM1DUI( n, coeff )
     integer		      n
     real	    coeff(n+15)

     subroutine	DZFFTM1DUI( n, coeff )
     integer		      n
     real*8		 coeff(n+15)

     C SPECIFICATION
     #include <fft.h>
     float *scfftm1dui(	int n, float *coeff);

     double *dzfftm1dui( int n,	double *coeff);

DESCRIPTION    [Toc]    [Back]

     Initialize, the coefficient array which is	used in	the Multiple 1D	FFT
     modules.  This array contains the different twiddle factors and the
     factorization of N	into prime numbers.
     As	the FFT	modules	scfftm1d or dzfftm1d only read the coeff array,	it may
     be	reused as long as necessary once it has	been initialized.

     In	C, if ptr is NULL, scfftm1dui or dzfftm1dui returns a pointer to an
     allocated buffer.

     SCFFTM1DUI	should be used to initialize the coefficient array before any
     call to SCFFTM1DU
     DZFFTM1DUI	should be used to initialize the coefficient array before any
     call to DZFFTM1DU

PARAMETERS    [Toc]    [Back]

     N - Integer. Specifies the	length of the sequence to be transformed.
      Unchanged	on exit.

     COEFF - Array (C or Fortran) or NULL pointer(C).

Example	of Calling Sequence
     Initializing a coefficient	array for real-to-complex FFTs of size 200.

     Fortran :
	  real coeff(200+15)
	  call scfftm1dui( 200,	coeff)

     C :
	  #include <fft.h>
	  float	*coeff;



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scfftm1dui,dzfftm1dui(3F)			     scfftm1dui,dzfftm1dui(3F)



	 coeff = scfftm1dui( 200, NULL);

SEE ALSO    [Toc]    [Back]

	  fft, scfftm1du, dzfftm1du


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