[R] higher derivatives using deriv

[alexander16]

Dear Spencer, Dear Ted,

thanks for your quick and detailled answers.

I should have indicated that I use the Ryacas package - for example:

library(Ryacas)
x <- Sym("x")
Simplify(deriv(x^3),x,2))

Just now I have realized that the deriv function is translated
to the Deriv function in yacas, which seems to be identical to the D
function in yacas. For instance:
deriv(sin,x) translates into Deriv(x)Sin(x) which again is equal to
D(x)Sin(x).

Now "D(x,n) expression" will give the n-th derivative with respect to x in
yacas.
Apparently sending deriv to yacas as in my example results  in
Deriv(x,2)x^3.

Thanks again for your help!
alex



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