Dear all,
many thanks, great work. Here is the feature which Peter suggested (it also
includes a string containing the variable name):
DD <- function(f, var.string="x", order=1){
res <- f
body.res <- body(f)
i <- 1
while(i <= order){
body.res <- D(body.res,var.string)
i <- i + 1
}
body(res) <- body.res
res
}
f <- function(t,alpha) t^alpha
DD(f,"t",2)(2,3)
Cheers,
marius
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