Dana
Thanks,

yes, it is true, you fft and you get a complex, you ifft and get back the
original.
however it should work when you already have a complex vector.

and that is the situation, I had a complex vector that I made with the
function complex(a,b).
the inverse is returning another complex? help!

is there a way to attach the file here to show you?

"Dana DeLouis" wrote:

I have a complex numbers, vector of size 128.

If you do a Fourier Transform, and then do an Inverse Fourier Transform, you
should end up with the original data.
How did you get the 128 Complex numbers? Where they calculated via fft?

The only thing I can think of is that, do to rounding, you have a very small
Imaginary part.
--
Dana DeLouis

"Daniel" wrote in message
...
I have a complex numbers vector of size 128.
when using the inverse fourier (and I used it before okay) it returns a
complex numbers vector instead of a real number vector as expected.
any idea?