Message-ID: <Xns9A6BE38B0E575dNOTwinscomcast@80.91.229.13>
Date: 2008-03-25T02:24:08Z
From: David Winsemius
Subject: derivatives in R
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