Re: [R] higher derivatives using deriv

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

Re: [R] higher derivatives using deriv

I suggest you look at the help pages for "expression" and "evel", then consider the following example in addition to the function "DD" in the "examples" for "deriv": Dxy <- deriv( ~x*y*z, c('x', 'y')) x <- 2; y <- 3; z <- 4 eval(Dxy) Dxy.fn <- deriv(expression(x*y*z), c('x', 'y'), TRUE) Dxy.fn

Re: [R] higher derivatives using deriv

See in-line below. On 03-Jan-2012 alexander16 wrote: > Dear everyone, > the following is obviously used to compute the nth derivative, > which seems to work > (deriv(sqrt(1 - x^2),x,n)) Well, it doesn't seem to work for me! In fact: n <- 2 (deriv(sqrt(1 - x^2),x,n)) # Error in deriv(sqrt(1

[R] higher derivatives using deriv

Dear everyone, the following is obviously used to compute the nth derivative, which seems to work (deriv(sqrt(1 - x^2),x,n)) However, before using this, I wanted to make sure it does what I think it does but can't figure it out when reading the ?deriv info or any other documentation on deriv for