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surface fit [message #3060]

Tue, 08 November 1994 01:05

buteau
Messages: 9
Registered: September 1992

Junior Member

Has somebody written a function to make two-dimensional fits.
I mean a kind of surface_fit , but not ony for polynomial function.
( I need to fit my surface with a gaussian and lorenz function).

Thanks in advance

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Re: surface fit [message #3148 is a reply to message #3060]

Tue, 08 November 1994 07:24

thompson
Messages: 584
Registered: August 1991

Senior Member

buteau@bali.saclay.cea.fr (A.Buteau 62 17) writes:

> Has somebody written a function to make two-dimensional fits.
> I mean a kind of surface_fit , but not ony for polynomial function.
> ( I need to fit my surface with a gaussian and lorenz function).

> Thanks in advance

One can use ordinary fitting routines for multidimensional fits. Suppose that
one had a grid of X,Y points. One can then define an index S over all possible
X,Y pairs. For example, if one had a grid of 10 X points by 10 Y points, then
S would be an index running from 0 to 99.

One then is not fitting F(X,Y) but F(S). All one needs to do then is to write
the definition of the function so that it can then determine X(S) and Y(S). A
simple way to do this is through a common block.

Bill Thompson

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