"Henrik Bengtsson" <[EMAIL PROTECTED]> writes:
> Hi,
>
> for 'affxparser' (Bioconductor), we needed a function to test if a
> certain package was loaded or not, but we did not want to load it if
> it wasn't, which is why we couldn't use require(). We came up with
> the following solution:
>
> isPackageLoaded <- function(package, version=NULL, ...) {
> s <- search();
> if (is.null(version)) {
> s <- sub("_[0-9.-]*", "", s);
> } else {
> package <- manglePackageName(package, version);
> }
> pattern <- sprintf("package:%s", package);
> (pattern %in% s);
> }
This only tests whether or not the given package is attached to the
search path. You also (I think) want to search loaded namespaces.
But I think such a helper would be useful in general.
+ seth
--
Seth Falcon | [EMAIL PROTECTED] | blog: http://userprimary.net/user/
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