[R] a weird question about gdata:::

[Bert Gunter]

??namespace
?getAnywhere
?"::"

See also:  http://www.stat.uiowa.edu/~luke/R/namespaces/morenames.pdf

Bottom line: namespaces provide a mechanism to "hide"  certain
variables within a package. Special measures as documented above are
required to view them

-- Bert

On Sun, Dec 4, 2011 at 1:19 PM, Erin Hodgess <erinm.hodgess at gmail.com> wrote:
> Dear R People:
>
> If I put in:
>
>> findPerl
> Error: object 'findPerl' not found
>
>
> But if I use:
>
>> gdata:::findPerl
> function (perl, verbose = "FALSE")
> {
>    errorMsg <- "perl executable not found. Use perl= argument to
> specify the correct path."
>    if (missing(perl)) {
>        perl = "perl"
>    }
>    perl = Sys.which(perl)
>    if (perl == "" || perl == "perl")
>        stop(errorMsg)
>    if (.Platform$OS == "windows") {
>        if (length(grep("rtools", tolower(perl))) > 0) {
>            perl.ftype <- shell("ftype perl", intern = TRUE)
>            if (length(grep("^perl=", perl.ftype)) > 0) {
>                perl <- sub("^perl=\"([^\"]*)\".*", "\\1", perl.ftype)
>            }
>        }
>    }
>    if (verbose)
>        cat("Using perl at", perl, "\n")
>    perl
> }
> <environment: namespace:gdata>
>>
>
> Why does one work but not the other, please?
>
> Thanks,
> Erin
>
> --
> Erin Hodgess
> Associate Professor
> Department of Computer and Mathematical Sciences
> University of Houston - Downtown
> mailto: erinm.hodgess at gmail.com
>
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> PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.



-- 

Bert Gunter
Genentech Nonclinical Biostatistics

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