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Re: Fitting with three parameters ??? [message #88765 is a reply to message #88760]

Mon, 16 June 2014 12:22

Russell Ryan
Messages: 122
Registered: May 2012

Senior Member

There are dozens of ways to do this, the MPFIT library is just one (albeit a very good one). IDL has several functions for minimization and there are dozens more available else where.

http://www.exelisvis.com/docs/routines-47.html

Russell

On Monday, June 16, 2014 6:49:18 AM UTC-4, Madhavan Bomidi wrote:

> Hello,
>
>
>
> I have two columns of data, say variables X and Y. Now I want to fit the data with a function Y = x1 - x2 * exp(-x3 * X). I do not know what the values of x1, x2 and x3.
>
>
>
> Can anyone say if there is automatic way in IDL to define our fitting function and then obtain the fitted parameters to the data? How is non-linear fitting done in IDL? Also, I would like to know which function will be able to give me R2 correlation coefficient?
>
>
>
> Thanks in advance,
>
> Madhavan

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[Message index]

		Fitting with three parameters ??? By: atmospheric physics on Mon, 16 June 2014 03:49
		Re: Fitting with three parameters ??? By: Moritz Fischer on Mon, 16 June 2014 03:55
		Re: Fitting with three parameters ??? By: Russell Ryan on Mon, 16 June 2014 12:22

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