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Re: 2D-fit [message #38284 is a reply to message #38283]

Tue, 02 March 2004 07:53

Paul Van Delst[1]
Messages: 1157
Registered: April 2002

Senior Member

Esa Riihonen wrote:
>
> 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').
>
> So the question what is the best way of doing this in IDL?

*THE* best way would be to download Craig Markwardt's MPFIT library and use that. Not only
is it more robust than equivalent IDL procedures, there's a *lot* more functionality that
will allow you to fit stuff oh so much faster.

Seriously, go to

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

and grab his MPFIT library.

paulv

--
Paul van Delst
CIMSS @ NOAA/NCEP/EMC

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[Message index]

		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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