On Mon, 31 Jan 2011, 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.
Do you mean an R package or an OS library (aka DLL)? I'll assume the
former, but please do use accurate terminology.
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.
Did you check the return value? It does do something: compute a
return value. You can also check
"package:phangorn" %in% search()
This must be simple, but I can't figure it out! Any help appreciated...
Cheers!
Nick
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====================================================
Nicholas J. Matzke
Ph.D. Candidate, Graduate Student Researcher
Huelsenbeck Lab
Center for Theoretical Evolutionary Genomics
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"[W]hen people thought the earth was flat, they were wrong. When people
thought the earth was spherical, they were wrong. But if you think that
thinking the earth is spherical is just as wrong as thinking the earth is
flat, then your view is wronger than both of them put together."
Isaac Asimov (1989). "The Relativity of Wrong." The Skeptical Inquirer,
14(1), 35-44. Fall 1989.
http://chem.tufts.edu/AnswersInScience/RelativityofWrong.htm
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--
Brian D. Ripley, rip...@stats.ox.ac.uk
Professor of Applied Statistics, http://www.stats.ox.ac.uk/~ripley/
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