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Re: 2-d fitting [message #63540 is a reply to message #63532]

Tue, 11 November 2008 23:02

Craig Markwardt
Messages: 1869
Registered: November 1996

Senior Member

On Nov 12, 12:25 am, xqinshan <xqins...@tom.com> wrote:
> Hi,
> I have a set of data zi at indepent vaiables (xi,yi). I want to get
> coefficients of a fiting function such as f(x,y)=a*f1(x,y)+b*f2(x,y)
> +c*f3(x,y)+..., f1(x,y),f2(x,y)... are given by myself. If f1(x,y),f2
> (x,y)... are polunomials, we can use sfit or mpfitfun to do it. Are
> there any routins to do it?

Yes, but MPFITFUN is not limited to polynomials, it can be any
function you wish, including multiple variables.

http://www.physics.wisc.edu/~craigm/idl/fitqa.html#multivar

If the user function is a linear combination of known functions, then
SVDFIT can also be used.

Craig

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[Message index]

		Re: 2-d fitting By: R.G. Stockwell on Wed, 12 November 2008 10:00
		Re: 2-d fitting By: xqinshan on Wed, 12 November 2008 05:29
		Re: 2-d fitting By: Craig Markwardt on Tue, 11 November 2008 23:02
		Re: 2-d fitting By: xqinshan on Wed, 12 November 2008 17:39

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