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inverse fourier transform

From: Heber Farnsworth
Subject: inverse fourier transform
Date: Wed, 2 Apr 2003 00:45:48 -0600

Some of you will laugh at me for this but I've never done an inverse fourier transform. I need to use a probability density function which I don't know in closed form but I do have a closed form for it's characteristic function (fourier transform). But when I try ifft I get something that is complex. I know that this thing is the fourier transform of a real density. How do I get a real (not complex) thing out of this? Here some things I'm not sure about which may be causing my confusion.

1. I'm not sure what range of frequencies to use: [-pi,pi]? something else?

2.  I may not be using fftshift correctly.

Is there anyone out there that does this a lot that can give me some pointers?

Heber Farnsworth

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