[R] Approximate a f(x,y)

[Liaw, Andy]

The `akima' package on CRAN probably would help.

HTH,
Andy

> From: Naji
> 
> Hi all,
> 
> 
> Running simulations, I'm generating market response to 2 factors X&Y..
> There is no closed form for the market response.. The results 
> are store in a
> matrix Z(X <- seq(.02,.98,.02), Y <- seq(.01,.19,.01))..
> For optmization purpose I need to approximate the values for 
> any factor X in
> 0,02-0,98 and Y in 0,01-0,19
> 
> How can I do it ?
> 
> For one factor : Xn-1 < x <= Xn
> f(x)=(f(Xn-1)*(x-Xn-1)+f(Xn)*(Xn-x))/(Xn-Xn-1)
> I don't know how to generalize this for two factors..
> 
> 
> Thanks in Advance
> Naji
> 
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