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Re: simultaneous fitting [message #56702]

Sat, 10 November 2007 21:01

Craig Markwardt
Messages: 1869
Registered: November 1996

Senior Member

virgil1612@gmail.com writes:
> This is my first post here, so hi to everybody. As a disclaimer, I am
> a novice IDL user.
>
> I'm using LMFIT to make a chi square fitting of a function depending
> on some parameters to my data points, and it works great. But now the
> problem is that I need to simultaneously fit two functions depending
> on the same set of parameters to these points.
>
> I have no idea how to make the two functions simultaneous chi square
> fitting.
> Someone can help?

Fitting programs like LMFIT or MPFIT don't really care how many
functions you have. If you have two data sets Y1 and Y2, then you can
"glue" them together with a command like this,
Y = [Y1, Y2]
and in your model function, you would do the same thing, something
like,
F = [F1(X,P), F2(X,P)]
where F1() and F2() are your different functions, which are functions
of the same independent variable and the parameter set P.

Good luck,
Craig

--
------------------------------------------------------------ --------------
Craig B. Markwardt, Ph.D. EMAIL: craigmnet@REMOVEcow.physics.wisc.edu
Astrophysics, IDL, Finance, Derivatives | Remove "net" for better response
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[Message index]

		Re: simultaneous fitting By: Craig Markwardt on Sat, 10 November 2007 21:01
		Re: simultaneous fitting By: Vince Hradil on Sat, 10 November 2007 11:07
		Re: simultaneous fitting By: virgil1612 on Fri, 09 November 2007 13:20
		Re: simultaneous fitting By: virgil1612 on Mon, 12 November 2007 08:19

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