second derivatives calculation

["vito muggeo" <vitomuggeo@hotmail.com>]

Hi all,
I used the following code to get the value of myfn() and its first 
derivatives
at x=10 with K=2 and U=3, for istance

myfn<-deriv(~K*x+U*x/K, c("K","U"), function(x,K,U){})
K<-2; U<-3
myfn(10,K,U)

Is there any way to calculate also the second (and maybe third, fourth,...)
derivatives of myfn()?
Thanks,
vito







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