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Re: Unidentified subject!

From: John Day
Subject: Re: Unidentified subject!
Date: Sun, 26 Nov 2000 15:22:03 -0500

At 01:44 PM 11/26/00 -0800, Abhra Haldar wrote:

I have a file made up of thousands of characters a's, b's, c's d's. I need to know how to open this file, divide it into chunks of 2048 characters, and take the Fast Fourier Transform of each of these segments. Can anyone help? Thanks

I'm not sure what you want to achieve. Fourier transforms can't be obtained directly from character streams. Perhaps you could compute the densities of each character over the range of the file. You would need to determine some appropriate bin-size and accumulate counts in each bin for each type of symbol. These density counts correspond to a kind of spatial amplitude, so if you took the Fourier transform of these densities you would obtain a measure of spatial frequencies of the density space.

Does that make any sense?

John Day
Staff Scientist
Computer Science InnovationsŠþjday

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