rvfft - real vector fft
void rvfft (x,lx,nx,isign,scale,mode)
input/output array
length of real vectors
number of vectors; must be a power of 2
sign of sqrt(-1)
scale factor; sqrt(2./lx) conserves energy
1 for nx real to nx/2 complex 2 for nx real to nx/2+1 complex -1 for nx/2 complex to nx real -2 for nx/2+1 complex to nx real
Real fast Fourier transform between vectors of an array. Rvfft takes a 2D panel and does a real to complex or viceversa fast fourier transform across the second dimension, of all the time samples. The arguments are as follows:
the refft manpage,the rvfft manpage,the cvfft manpage
sepfft