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Checks if a package is loaded or not. Note that, contrary to require(), this function does not load the package if not loaded.
require()
# S3 method for default isPackageLoaded(package, version=NULL, ...)
Returns a logical.
logical
The name of the package.
A character string specifying the version to test for. If NULL, any version is tested for.
character
NULL
Not used.
Henrik Bengtsson
To check if a package is installed or not, see isPackageInstalled().
isPackageInstalled