Local polynomial fit

[Luksa Kraljevic]

Hi!
I have measurements od 2d scalar and vector field
variable (metheorological data: teperature,wind)
done
on the irregular grid and i need to fit those data
on
a regular grid. I also have to calculate divergence
and rotation of the vector field (after i fit it on
the regular grid). I was hoping that octave might
help
me but  I couldn't find a way to do what i need (ok
i
know that i can program it but i wanted something
that
allready works).   
My question is is there some command in octave or
some
package i can download that will do the thing (fit
data to a regular grid first, and divergence and
rotation is not so important)?
 
Thanks!
Luksa


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