computing equation in the fourier domain

Hi There,

I have a distribution, P, which I want to FT and calculate:
fG = i*w / (1-fP)
where i=sqrt(-1), w is the frequency variable and fP is the fourier transform of P.

In a perfect world, I would write sth like:
fG = i*[1:256]./(1-fft(P))

This gives me strange result, so i conclude that the world is not perfect ;)
How should I perform this simple calculation?

Many thanks,
yuval.
.

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