On 29/12/2014 10:32 AM, Gerrit Draisma wrote:
> Just a curiosity question:
>
> In the documentation for the nlm procedure
> a find this example of defining a function
> with a gradient attribute:
> -----------
> f <- function(x, a)
> {
> res <- sum((x-a)^2)
> attr(res, "gradient") <- 2*(x-a)
> res
> }
> -----------
> I get the gradient with
> attr(f(3,2),"gradient")
> but how do I get the function value it self?
value <- f(3,2)
gradient <- attr(value, "gradient")
Duncan Murdoch
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