G'day Kevin,
On Wed, 18 Mar 2009 21:46:51 -0700
<rkevinbur...@charter.net> wrote:
> I was trying to find source for optimize and I ran across
>
> function (f, interval, ..., lower = min(interval), upper =
> max(interval), maximum = FALSE, tol = .Machine$double.eps^0.25)
> {
> if (maximum) {
> val <- .Internal(fmin(function(arg) -f(arg, ...), lower,
> upper, tol))
> list(maximum = val, objective = f(val, ...))
> }
> else {
> val <- .Internal(fmin(function(arg) f(arg, ...), lower,
> upper, tol))
> list(minimum = val, objective = f(val, ...))
> }
> }
>
> Then I did a search for fmin and i came up with:
>
> /* fmin(f, xmin, xmax tol) */
> SEXP attribute_hidden do_fmin(SEXP call, SEXP op, SEXP args, SEXP rho)
>
>
> So my question is where do I find the intermediary step between
>
> .Internal(fmin(function(arg) f(arg, ...), lower, upper, tol))
>
> and
>
> SEXP attribute_hidden do_fmin(SEXP call, SEXP op, SEXP args, SEXP rho)
@Article{Rnews:Ligges:2006,
author = {Uwe Ligges},
title = {{R} {H}elp {D}esk: {Accessing} the Sources},
journal = {R News},
year = 2006,
volume = 6,
number = 4,
pages = {43--45},
month = {October},
url = http,
pdf = Rnews2006-4
}
http://CRAN.R-project.org/doc/Rnews/Rnews_2006-4.pdf
> The number of arguments doesn't match up. I am guessing that lower
> and upper somehow get merged into the args. And rho is 'tol'. Right?
Unlikely. In "Writing R Extensions" (and the functions I looked up),
'rho' usually denotes an environment that is used to evaluate
expressions in. Typically (i.e. in cases that I had need to look at),
all arguments are rolled into the SEXP arg for internal functions.
HTH.
Cheers,
Berwin
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