require() but for source()d files
Dear useRs, I'm looking for something like require() but which will work on source()d files. I have a .R file with lots of functions and I'm writing a new function (say, 'foo') that depends on the functions from this file. Until now, I have always source()d the .R file before running 'foo'. But I would like to include some code in 'foo' to source() the file only if it hasn't been done yet, and do nothing if the file has already been source()d in the session. So, the same behavior as require() with packages, but with a .R file. Does it make sense? I could provide an example if you think it would help. Thank you in advance, Ivan
Ivan Calandra University of Franche-Comt? Laboratoire Chrono-Environnement Bureau ATER -107L 16, Route de Gray 25030 Besan?on Cedex, France ivan.calandra at univ-fcomte.fr +33 (0) 381 66 20 60 http://chrono-environnement.univ-fcomte.fr/spip.php?article1830