[R] derivatives in R

[David Winsemius]

Lavan <rsumithran at yahoo.com> wrote in
news:16265419.post at talk.nabble.com: 

> 
> Hi, I posted this message earlier in "Rmetrics" and I don't know
> whether I posted in the wrong place, so I'm posting it again in
> Rhelp. 
> 
> I have a function in x and y and let's call it f(x,y). I need to get
> the Hessian matrix. i.e I need (d^2f/dx^2), (d^2f/dxdy),
> (d^2f/dydx), (d^2f/dy^2).I can get these using the D function. now I
> need to evaluste the hessian matrix for -5<x<5 and -2<y<2 and I also
> need to print the output. 
> 
> I tried  using a for loop,but it is giving me an error. 

I was wondering if the fact that you provide neither an example nor even 
the text of the error that could be the explanation for no response.

-- 
David Winsemius