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Re: recommendations for curve fitting [message #55029 is a reply to message #54946]

Wed, 25 July 2007 12:19

willettk
Messages: 20
Registered: October 2006

Junior Member

On Jul 24, 11:55 am, Josh <joshuamonta...@gmail.com> wrote:
> i'm looking to add a trend- / fit-line to my plotted data, and not
> finding any really nice and easy way to do so. the plot is currently
> being generated with the PLOT command, and I'm not looking for
> anything much more complicated than a quadratic fit (probably even
> just linear). i tried using IPLOT and adding a curve fit there, but
> it didn't work very well and was kind of awkward.
>
> does anyone have any good recommendations for fitting a trendline to a
> scatter plot? as i said, it will probably be as simple as linear /
> quadratic in nature.
>
> thanks.

Craig Markwardt's MPFIT routine does an outstanding job of fitting
whatever function you like to the data. Look here for a good tutorial
and examples.

http://cow.physics.wisc.edu/~craigm/idl/fitting.html

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[Message index]

		recommendations for curve fitting By: Josh on Tue, 24 July 2007 10:55
		Re: recommendations for curve fitting By: Josh on Wed, 25 July 2007 14:26
		Re: recommendations for curve fitting By: willettk on Wed, 25 July 2007 12:19

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