| Re: IDL FFT Source Code [message #40169] |
Fri, 16 July 2004 07:56 |
Craig Markwardt
Messages: 1869
Registered: November 1996
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Senior Member |
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olde_english33@hotmail.com (Eric) writes:
> I was wondering if there was any way to view the source code for the
> FFT that IDL uses. I am running into some complications and I think
> that it could be caused by the way that IDL computes the FFT and then
> the math I'm doing after the transformation. Can anyone help me?!?
I'd just like to say that I've been a satisfied IDL FFT user for
years, with no numerical problems. There's always the question of
normalization, but that's true for all FFTs, not just IDL's.
Craig
--
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Craig B. Markwardt, Ph.D. EMAIL: craigmnet@REMOVEcow.physics.wisc.edu
Astrophysics, IDL, Finance, Derivatives | Remove "net" for better response
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| Re: IDL FFT Source Code [message #40180 is a reply to message #40169] |
Wed, 14 July 2004 11:59  |
R.G. Stockwell
Messages: 363
Registered: July 1999
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Senior Member |
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"Kenneth Bowman" <k-bowman@null.tamu.edu> wrote in message news:k-bowman-4FF73E.11124714072004@news.tamu.edu...
> In article <52822646.0407140820.497c0417@posting.google.com>,
> olde_english33@hotmail.com (Eric) wrote:
>
>> I was wondering if there was any way to view the source code for the
>> FFT that IDL uses. I am running into some complications and I think
>> that it could be caused by the way that IDL computes the FFT and then
>> the math I'm doing after the transformation. Can anyone help me?!?
>
> I don't think that is possible, but there was a discussion some months
> back about using external FFTs from IDL (FFTW, in particular). If you
> google this newsgroup for FFTW you should find that thread.
>
> Ken Bowman
And you can always write your own DFT and compare that result.
It'll be slow, but appropriate for a simple test case.
Cheers,
bob
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| Re: IDL FFT Source Code [message #40184 is a reply to message #40180] |
Wed, 14 July 2004 10:12 |
K. Bowman
Messages: 330
Registered: May 2000
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Senior Member |
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In article <52822646.0407140820.497c0417@posting.google.com>,
olde_english33@hotmail.com (Eric) wrote:
> I was wondering if there was any way to view the source code for the
> FFT that IDL uses. I am running into some complications and I think
> that it could be caused by the way that IDL computes the FFT and then
> the math I'm doing after the transformation. Can anyone help me?!?
I don't think that is possible, but there was a discussion some months
back about using external FFTs from IDL (FFTW, in particular). If you
google this newsgroup for FFTW you should find that thread.
Ken Bowman
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