[R] how to get higher derivatives with "deriv"

[mhofert]

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
-- 
View this message in context: http://r.789695.n4.nabble.com/how-to-get-higher-derivatives-with-deriv-tp2306711p2309761.html
Sent from the R help mailing list archive at Nabble.com.