On Jan 31, 2011, at 11:04 PM, Nick Matzke wrote:
Hi,
I've written a function which I load with a source command. The
function requires a certain library, phangorn, to work.
I would like the function to check if phangorn is loaded as a
library before running. For some reason, just putting
require(phangorn) into the sourced function doesn't do anything.
If a package is already loaded then require() will not load it again.
I think it is also going to be quiet if it's called in a sourced
routine, so I would ask whether you have properly tested your claim
that it "doesn't do anything"? If you start with a clean session and
source your routine, does the routine fail because the package does
not load?
This must be simple, but I can't figure it out! Any help
appreciated...
--
====================================================
Nicholas J. Matzke
Ph.D. Candidate, Graduate Student Researcher
30 line sig elided.
--
David Winsemius, MD
West Hartford, CT
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