cfft2b - compute a periodic sequence from its Fourier coefficients. The xFFT operations are unnormalized, so a call of xFFT2F followed by a call of xFFT2B will multiply the input sequence by M*N.
SUBROUTINE CFFT2B(M, N, A, LDA, WORK, LWORK) COMPLEX A(LDA,*) INTEGER M, N, LDA, LWORK REAL WORK(*) SUBROUTINE CFFT2B_64(M, N, A, LDA, WORK, LWORK) COMPLEX A(LDA,*) INTEGER*8 M, N, LDA, LWORK REAL WORK(*) F95 INTERFACE SUBROUTINE FFT2B(M, N, A, LDA, WORK, LWORK) COMPLEX, DIMENSION(:,:) :: A INTEGER :: M, N, LDA, LWORK REAL, DIMENSION(:) :: WORK SUBROUTINE FFT2B_64(M, N, A, LDA, WORK, LWORK) COMPLEX, DIMENSION(:,:) :: A INTEGER(8) :: M, N, LDA, LWORK REAL, DIMENSION(:) :: WORK C INTERFACE #include <sunperf.h> void cfft2b(int m, int n, complex *a, int lda, float *work, int lwork); void cfft2b_64(long m, long n, complex *a, long lda, float *work, long lwork);
Oracle Solaris Studio Performance Library cfft2b(3P) NAME cfft2b - compute a periodic sequence from its Fourier coefficients. The xFFT operations are unnormalized, so a call of xFFT2F followed by a call of xFFT2B will multiply the input sequence by M*N. SYNOPSIS SUBROUTINE CFFT2B(M, N, A, LDA, WORK, LWORK) COMPLEX A(LDA,*) INTEGER M, N, LDA, LWORK REAL WORK(*) SUBROUTINE CFFT2B_64(M, N, A, LDA, WORK, LWORK) COMPLEX A(LDA,*) INTEGER*8 M, N, LDA, LWORK REAL WORK(*) F95 INTERFACE SUBROUTINE FFT2B(M, N, A, LDA, WORK, LWORK) COMPLEX, DIMENSION(:,:) :: A INTEGER :: M, N, LDA, LWORK REAL, DIMENSION(:) :: WORK SUBROUTINE FFT2B_64(M, N, A, LDA, WORK, LWORK) COMPLEX, DIMENSION(:,:) :: A INTEGER(8) :: M, N, LDA, LWORK REAL, DIMENSION(:) :: WORK C INTERFACE #include <sunperf.h> void cfft2b(int m, int n, complex *a, int lda, float *work, int lwork); void cfft2b_64(long m, long n, complex *a, long lda, float *work, long lwork); ARGUMENTS M (input) Number of rows to be transformed. These subroutines are most efficient when M is a product of small primes. M >= 0. N (input) Number of columns to be transformed. These subroutines are most efficient when N is a product of small primes. N >= 0. A (input/output) On entry, a two-dimensional array A(M,N) that contains the sequences to be transformed. LDA (input) Leading dimension of the array containing the data to be transformed. LDA >= M. WORK (input) On input, workspace WORK must have been initialized by CFFT2I. LWORK (input) The dimension of the array WORK. LWORK >= (4 * (M + N) + 30) 7 Nov 2015 cfft2b(3P)