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Re: Doing a DFT in IDL [message #79772]

Tue, 03 April 2012 02:23

Helder Marchetto
Messages: 520
Registered: November 2011

Senior Member

On Monday, April 2, 2012 11:24:15 PM UTC+2, Kenneth P. Bowman wrote:
>> Dear all,
>> I've been looking for this around, but couldn't yet find anything.
>> I would like to made a (discrete) Fourier transform by directly typing in the
>> code. The target is not performance, but eventually modifying the source
>> (integrated) function from [f(x)exp(-j2piux/N)] to something different.
>> Has anybody written such a code in IDL that can be modified? Or can anybody
>> give me a working link to such a code?
>>
>> Many thanks and sorry for wasting your time.
>> Cheers, Helder
>
> A DFT is just a set of dot products. (And an FFT is an efficient way to
> carry out the DFT calculations.)
>
> Compute the basis functions that you want at the tabulated points,
> then multiply by the function you are transforming and sum.
> You can write it as a matrix-vector multiplication.
>
> Ken Bowman

Dear Ken,
thanks for your reply. I think I will have to write it, but to avoid beginners errors, I wanted to modify an available code. That's all.
Cheers, Helder

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[Message index]

		Re: Doing a DFT in IDL By: Helder Marchetto on Tue, 03 April 2012 02:23
		Re: Doing a DFT in IDL By: Helder Marchetto on Tue, 03 April 2012 02:21
		Re: Doing a DFT in IDL By: Kenneth P. Bowman on Mon, 02 April 2012 14:24
		Re: Doing a DFT in IDL By: Russell[1] on Mon, 02 April 2012 07:19

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