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Re: learning how to use mpfit,. need help [message #87746 is a reply to message #87740]

Tue, 25 February 2014 15:42

Harald Frey
Messages: 41
Registered: March 1997

Member

On Tuesday, February 25, 2014 1:35:53 PM UTC-8, alk...@gmail.com wrote:
> Hi
>
>
>
> I am new to idl and learning how to use mpfit but run into error, please help if you have time.
>
>
>
>
>
> IDL version 6.3
>
>
>
> ////////////////////
>
> IDL> x = findgen(101)
>
> IDL> y = 25.*exp(-(x-32.)^2/(2*5.^2))+2.*randomn(0,101)
>
> % Program caused arithmetic error: Floating underflow
>
> ///////////////////
>
>
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> these are the tutorial from the daedalus.as.arizona.edu group.
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> thanks in advance.
>
>
>
> LR

Do this in double precision and you will not get the error:

IDL> x = dindgen(101)
IDL> y = 25.*exp(-(x-32.)^2/(2*5.^2))+2.*randomn(0,101)

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[Message index]

		learning how to use mpfit,. need help By: alkyl47 on Tue, 25 February 2014 13:35
		Re: learning how to use mpfit,. need help By: David Fanning on Tue, 25 February 2014 13:44
		Re: learning how to use mpfit,. need help By: alkyl47 on Tue, 25 February 2014 13:55
		Re: learning how to use mpfit,. need help By: Harald Frey on Tue, 25 February 2014 15:42
		Re: learning how to use mpfit,. need help By: Craig Markwardt on Tue, 25 February 2014 20:13

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