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matrix

Lavan 
Hi, I'm new to R and need some help.

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.

Thanks