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Re: 2D-fit [message #38277]

Tue, 02 March 2004 09:36

Craig Markwardt
Messages: 1869
Registered: November 1996

Senior Member

Esa Riihonen <esa@riihonen.st.net> writes:

> Hi all!
>
> I seek advice on fitting a following function with 2-free variables mu and
> phi (Below '.' indicates multiplication and '^2' power of 2 ):
>
> F(mu,phi) = a0 + a1.mu + a2.mu^2 + (a3.mu + a4.mu^2).cos(phi-phi0),
>
> phi0 is a constant and ai are the fitting parameters.
>
> Measurement set consists of 240 values (10 values for mu and 24 for phi,
> this in effect a polar coordinate grid with 24 'sectors' and 10 'rings').

Greetings, in addition to Paul's reply, I would like to mention that
my FAQ contains discussion of fitting functions of more than one
variable. And, if you have an even spaced 2D grid, then you can
likely use MPFIT2DFUN.

Craig

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Craig B. Markwardt, Ph.D. EMAIL: craigmnet@REMOVEcow.physics.wisc.edu
Astrophysics, IDL, Finance, Derivatives | Remove "net" for better response
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		Re: 2D-fit By: Craig Markwardt on Tue, 02 March 2004 09:36
		Re: 2D-fit By: Esa Riihonen on Tue, 02 March 2004 08:58
		Re: 2D-fit By: Paul Van Delst[1] on Tue, 02 March 2004 07:53
		Re: 2D-fit By: Esa Riihonen on Wed, 03 March 2004 00:53

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