[R] Looking up the directory a file is located in

[Cliff Clive]

The dirname() function looks very helpful; I hadn't heard of that one before.

I'm still reading up to see how the parent.frame command does what it does;
I didn't realize that the ofile variable might not be around in the future.  

Richard's suggestion -- source("c:/myfullpath/myfile.r", chdir=TRUE) -- is
probably the best; I would still have to update "myfullpath" if I move
myfile.r, but that's not hard to do.

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