[R] extracting more information from optim in R?

Bart Joosen bartjoosen at hotmail.com
Wed Jan 12 15:37:05 CET 2011

I have no experience with writing C code, but if I have such problems in R
code, I add a line to my function which prints the values to the console:
fr <- function(x) {   ## Rosenbrock Banana function
    x1 <- x[1]
    x2 <- x[2]
	cat (paste(x1, x2, "\n"))
    100 * (x2 - x1 * x1)^2 + (1 - x1)^2
optim(c(-1.2,1), fr)

If the same goes for C, I don't know.

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