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Re: How to do surface fit? [message #10782]

Wed, 28 January 1998 00:00

Gang Chen
Messages: 4
Registered: January 1998

Junior Member

> Use the KX keyword to SFIT, it will return an array of coefficients, in
> your case:
>
> IDL> zfit = SFIT(z,2,KX=k)>
> IDL> help,k
> COEFF FLOAT = Array[3, 3]
>
> They are calculated with the convention X= 0,...,NX and Y=0,...,NY
> (so you must to make the needed conversion).

Hi Evilio,

I really appreciate your help on this. It seems that it almost works the
way Iwanted. But I have another question: Since the default grids are
set withX= 0,...,NX and Y=0,...,NY in the source code for SFIT, how can
I do for anon-uniform grids (e.g., X=0, 1, 4, 5, 9, ..., and Y=3, 4, 7,
11, ..)? Do I have to resort to interpolation so that values at uniform
grids can be distributed?

Many thanks,
Gang Chen == gang@cochise.biosci.arizona.edu

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[Message index]

		Re: How to do surface fit? By: Gang Chen on Wed, 28 January 1998 00:00
		Re: How to do surface fit? By: Evilio del Rio on Wed, 28 January 1998 00:00

Previous Topic:	How to do Surface Fitting with Singular Value Decompositin (SVD)?
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