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Re: IDL is not accurate enough! [message #62188 is a reply to message #62177]

Thu, 28 August 2008 09:42

Foldy Lajos
Messages: 268
Registered: October 2001

Senior Member

On Thu, 28 Aug 2008, noahh.schwartz@gmail.com wrote:

> Hi,
>
> 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?
>
> Thanks,
> Noah
>

gamma(x)/gamma(y) => exp(lngamma(x)-lngamma(y))

regards,
lajos

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[Message index]

		Re: IDL is not accurate enough! By: Kenneth P. Bowman on Thu, 28 August 2008 13:50
		Re: IDL is not accurate enough! By: Foldy Lajos on Thu, 28 August 2008 09:42
		Re: IDL is not accurate enough! By: David Fanning on Thu, 28 August 2008 09:35
		Re: IDL is not accurate enough! By: noahh.schwartz on Thu, 11 September 2008 07:10
		Re: IDL is not accurate enough! By: rtk on Thu, 04 September 2008 11:46
		Re: IDL is not accurate enough! By: Haje Korth on Mon, 08 September 2008 06:45

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