refft - real fft
void refft (x,lx,isign,scale,mode)
input/output array
length of real array; must be a power of 2
sign of sqrt(-1)
scale factor; sqrt(2./lx) conserves energy
1 for lx real to lx/2 complex 2 for lx real to lx/2+1 complex -1 for lx/2 complex to lx real -2 for lx/2+1 complex to lx real
Real fast Fourier transform along one trace. C language subroutine for a one-dimensional real to complex or viceversa fast Fourier transform. refft performs transforms between elements of a vector. The arguments are as follows:
the refft manpage,the rvfft manpage,the cvfft manpage
sepfft