vdcosqf
vdcosqf - compute the Fourier coefficients in a cosine series representation with only
odd wave numbers.
The VCOSQ operations are normalized, so a call
of VCOSQF followed by a call of VCOSQB will return the original sequence.
SUBROUTINE VDCOSQF( M, N, X, XT, MDIMX, WSAVE)
INTEGER M, N, MDIMX
DOUBLE PRECISION X(MDIMX,*), XT(MDIMX,*), WSAVE(*)
SUBROUTINE VDCOSQF_64( M, N, X, XT, MDIMX, WSAVE)
INTEGER*8 M, N, MDIMX
DOUBLE PRECISION X(MDIMX,*), XT(MDIMX,*), WSAVE(*)
SUBROUTINE COSQF( [M], [N], X, XT, [MDIMX], WSAVE)
INTEGER :: M, N, MDIMX
REAL(8), DIMENSION(:) :: WSAVE
REAL(8), DIMENSION(:,:) :: X, XT
SUBROUTINE COSQF_64( [M], [N], X, XT, [MDIMX], WSAVE)
INTEGER(8) :: M, N, MDIMX
REAL(8), DIMENSION(:) :: WSAVE
REAL(8), DIMENSION(:,:) :: X, XT
#include <sunperf.h>
void vdcosqf(int m, int n, double *x, double *xt, int mdimx, double *wsave);
void vdcosqf_64(long m, long n, double *x, double *xt, long mdimx, double *wsave);
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* M (input)
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The number of sequences to be transformed. M >= 0.
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* N (input)
-
Length of the sequence to be transformed. These subroutines are most efficient when N is a product of
small primes. N >= 0.
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* X (input/output)
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On entry, an array of length N containing the sequence to be
transformed. For VCOSQF, a real two-dimensional array with dimensions
of (MDIMX x N) whose rows contain the sequences to be
transformed. On exit, the quarter-wave cosine transform of the input.
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* XT (input)
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A real two-dimensional work array with dimensions of (MDIMX x N).
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* MDIMX (input)
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Leading dimension of the arrays X and XT as specified in a dimension or type statement.
MDIMX >= M.
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* WSAVE (input)
-
On entry, an array of dimension (2 * N + 15) or greater initialized by VCOSQI.