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...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. Thanks -- View this message in context: http://www.nabble.com/derivatives-in-R-tp16265419p16265419.html Sent from the R help mailing list archive...