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Re: IDL is not accurate enough! [message #62190 is a reply to message #62188] Thu, 28 August 2008 09:35 Go to previous messageGo to previous message
David Fanning is currently offline  David Fanning
Messages: 11724
Registered: August 2001
Senior Member
noahh.schwartz@gmail.com writes:

> I've been having problems with IDL accuracy. I'm trying to perform
> calculations using the gamma function. The problem is that it grows
> VERY fast! Performing this calculation in double (namely gamma(x)/
> gamma(y) with x and y big) yields the result: NaN...
> Would it be possible to use a program like 'Mathematica' (or any
> other) and to plug it in my ILD program? Some kind of CALL_EXTERNAL
> that is to say. If it is possible, how can I do it and what is the
> best program to use?

It seems *highly* unlikely to me that IDL's implementation
of DOUBLE is any less accurate than any other program's
implementation. In fact, this probably has something to
do with the *computer* and not with the program. :-)

Cheers,

David

--
David Fanning, Ph.D.
Fanning Software Consulting, Inc.
Coyote's Guide to IDL Programming (www.dfanning.com)
Sepore ma de ni thui. ("Perhaps thou speakest truth.")

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