FFT Routines

cfft1d / zfft1d compute a forward or inverse FFT of a complex vector (in-place).
Fortran:
call cfft1d (r, n, isign, wsave) call zfft1d (r, n, isign, wsave) C:
void cfft1dc (float* r, float* i, int n, int isign, float* wsave); void zfft1dc (double* r, double* i, int n, int isign, double* wsave);

scfft1d / dzfft1d compute forward FFT of a real vector and represent the complex conjugate-symmetric result in CCS format (in-place).
Fortran:
call scfft1d (r, n, isign, wsave) call dzfft1d (r, n, isign, wsave) C:
void scfft1dc (float* r, int n, int isign, float* wsave); void dzfft1dc (double* r, int n, int isign, double* wsave);

csfft1d / zdfft1d compute inverse FFT of a complex conjugate-symmetric vector packed in CCS format (in-place).
Fortran:
call csfft1d (r, n, isign, wsave) call zdfft1d (r, n, isign, wsave) C:
void csfft1dc (float* r, int n, int isign, float* wsave); void zdfft1dc (double* r, int n, int isign, double* wsave);

cfft2d / zfft2d compute a forward or inverse FFT of a complex matrix (in-place).
Fortran:
call cfft2d (r, m, n, isign) call zfft2d (r, m, n, isign) C:
void cfft2dc (float* r, float* i, int m, int n, int isign); void zfft2dc (double* r, double* i, int m, int n, int isign);

scfft2d / dzfft2d compute forward FFT of a real matrix and represent the complex conjugate-symmetric result in CCS format (in-place).
Fortran:
call scfft2d (r, m, n) call dzfft2d (r, m, n) C:
void scfft2dc (float* r, int m, int n); void dzfft2dc (double* r, int m, int n);

csfft2d / zdfft2d compute inverse FFT of a complex conjugate-symmetric matrix packed in CCS format (in-place).
Fortran:
call csfft2d (r, m, n) call zdfft2d (r, m, n) C:
void csfft2dc (float* r, int m, int n); void zdfft2dc (double* r, int m, int n);