[R] donlp2

Dear Sir, I am working with one example in R donlp2. How I can get the Hessian matrix from the output. p = c(10,10) par.l = c(-100,-100) par.u = c(100,100) nlin.l = nlin.u = 2 fn = function(x) { x[1]^2+x[2]^2 } dfn = function(x){ c(2*x[1], 2*x[2]) } attr(fn, "gr") = dfn nlcon = function(x){ x

[R] Error

Dear Sir, I installed successfully using the install.packages("Rdonlp2", repos=" http://R-Forge.R-project.org";). I tried on the example which is defined on the Rdonlp help file ,p <- c(-10,10)par.l <- c(0,0); par.u <- c(100,100)lin.u <- 1; lin.l <- 1A <- t(c(1,1))fn <- function(x){ x[1]^2+x[2]^2}r