cfft1di man page on IRIX

Man page or keyword search:  
man Server   31559 pages
apropos Keyword Search (all sections)
Output format
IRIX logo
[printable version]



cfft1di,zfft1di(3F)					   cfft1di,zfft1di(3F)

NAME
     cfft1di, zfft1di - initialize the coefficient array for Complex-to-
     Complex 1D FFT modules.

SYNOPSYS
     FORTRAN SPECIFICATION
     subroutine CFFT1DI( n, coeff )
     integer		 n
     complex		 coeff(n+15)

     subroutine ZFFT1DI( n, coeff )
     integer		 n
     double complex	 coeff(n+15)

     C SPECIFICATION
     #include <fft.h>
     complex *cfft1di( int n, complex *coeff);

     zomplex *zfft1di( int n, zomplex *coeff);

DESCRIPTION
     Initialize the coefficient array which is used in the FFT modules.	 This
     array contains the different twiddle factors and the factorization of N
     into prime numbers.
     As the FFT modules cfft1d or zfft1d only read the coeff array, it may be
     reused as long as necessary once it has been initialized.

     In C, if ptr is NULL, cfft1di or zfft1di returns a pointer to an
     allocated buffer.

     CFFT1DI should be used to initialize the coeeficient array before any
     call to CFFT1D
     ZFFT1DI should be used to initialize the coeeficient array before any
     call to ZFFT1D

PARAMETERS
     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 complex-to-complex FFTs of size 200.

     Fortran :
	  complex coeff(200+15)
	  call cfft1di( 200, coeff)

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

									Page 1

cfft1di,zfft1di(3F)					   cfft1di,zfft1di(3F)

	 coeff = cfft1di( 200, NULL);

SEE ALSO
	  fft, cfft1d, zfft1d

									Page 2

[top]

List of man pages available for IRIX

Copyright (c) for man pages and the logo by the respective OS vendor.

For those who want to learn more, the polarhome community provides shell access and support.

[legal] [privacy] [GNU] [policy] [cookies] [netiquette] [sponsors] [FAQ]
Tweet
Polarhome, production since 1999.
Member of Polarhome portal.
Based on Fawad Halim's script.
....................................................................
Vote for polarhome
Free Shell Accounts :: the biggest list on the net