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Re: Missing data and MPFITFUN [message #50919 is a reply to message #50905]

Mon, 23 October 2006 07:54

David Fanning
Messages: 11724
Registered: August 2001

Senior Member

Craig Markwardt writes:

> You might ask, why not ignore points with NaNs? The answer is, there
> are two many people who were blithely allowing their data or model to
> go infinite and then complaining to me when MPFIT didn't work. I
> prefer to force the user to explicitly set the weight to zero for
> points they want to ignore, rather than silently ignoring them. Then
> if non-finite values show up, MPFIT knows it's a problem.
>
> Perhaps I should add a /NAN keyword though.

I've tried educating the masses. I've, uh, mostly given up. :-)

If you are going to add a NAN keyword though (which I
think is a good idea), I would also consider setting
the weights at that location to 0 yourself. (This is
probably what you had in mind.) I'm pretty sure users
won't remember to do it.

Thanks for the help!

Cheers,

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

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[Message index]

		Re: Missing data and MPFITFUN By: googlegroups on Tue, 24 October 2006 06:51
		Re: Missing data and MPFITFUN By: David Fanning on Mon, 23 October 2006 07:54
		Re: Missing data and MPFITFUN By: Craig Markwardt on Mon, 23 October 2006 07:44
		Re: Missing data and MPFITFUN By: David Fanning on Mon, 23 October 2006 07:20
		Re: Missing data and MPFITFUN By: googlegroups on Mon, 23 October 2006 06:57
		Re: Missing data and MPFITFUN By: Allan Whiteford on Mon, 23 October 2006 04:09
		Re: Missing data and MPFITFUN By: Craig Markwardt on Sat, 28 October 2006 11:57

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