complex_fft

This routine performs a forward or backward Fast Fourier Transformation on its argument data.

Location in HEALPix directory tree: src/f90/mod/healpix_fft.F90 

FORMAT

call complex_fft( data, backward )

ARGUMENTS

name&dimensionality	kind	in/out	description
data(:)	XXX	INOUT	array containing the input and output data. It can be of type real(sp), real(dp), complex(spc) or complex(dpc). If it is of type real, it is interpreted as an array of size(data)/2 complex variables.
backward	LGT	IN	Optional argument. If present and true, perform backward transformation, else forward

EXAMPLE:

use healpix_fft
call complex_fft (data, backward=.true.)

Performs a backward FFT on data.

RELATED ROUTINES

This section lists the routines related to complex_fft

real_fft

routine for FFT of real data