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dcosqb(3P)		    Sun Performance Library		    dcosqb(3P)

NAME
       dcosqb - synthesize a Fourier sequence from its representation in terms
       of a cosine series with odd wave	 numbers.   The	 COSQ  operations  are
       unnormalized  inverses  of themselves, so a call to COSQF followed by a
       call to COSQB will multiply the input sequence by 4 * N.

SYNOPSIS
       SUBROUTINE DCOSQB(N, X, WSAVE)

       INTEGER N
       DOUBLE PRECISION X(*), WSAVE(*)

       SUBROUTINE DCOSQB_64(N, X, WSAVE)

       INTEGER*8 N
       DOUBLE PRECISION X(*), WSAVE(*)

   F95 INTERFACE
       SUBROUTINE COSQB([N], X, WSAVE)

       INTEGER :: N
       REAL(8), DIMENSION(:) :: X, WSAVE

       SUBROUTINE COSQB_64([N], X, WSAVE)

       INTEGER(8) :: N
       REAL(8), DIMENSION(:) :: X, WSAVE

   C INTERFACE
       #include <sunperf.h>

       void dcosqb(int n, double *x, double *wsave);

       void dcosqb_64(long n, double *x, double *wsave);

ARGUMENTS
       N (input) Length of the sequence to be transformed.  These  subroutines
		 are most efficient when N is a product of small primes.  N >=
		 0.

       X (input/output)
		 On entry, an array of length N containing the sequence to  be
		 transformed.	On  exit, the quarter-wave cosine synthesis of
		 the input.

       WSAVE (input)
		 On entry, an array with dimension of at least (3 *  N	+  15)
		 that has been initialized by DCOSQI.

				  6 Mar 2009			    dcosqb(3P)
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