See end of message.
On 05/12/11 10:19, Erin Hodgess 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?
Because "findPerl" is ``not exported'' from the gdata namespace.
Uhhh, what does that mean? I have a vague idea, but I'm not sufficiently
confident/competent to elaborate. You'll just have to read up on
namespaces.
I'm *sure* namespaces are really a Good Thing, but they sure do add to the
mysteries of R usage.
Has Pat Burns written anything by way of explaining namespace to bunnies
like me?
cheers,
Rolf
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