[R] R equiv of #ifdef?

Bill Simpson wsimpson at gcal.ac.uk
Mon Jun 7 12:09:46 CEST 1999

I was wondering if R has an equivalent of #ifdef.
I want the code to check if a function has been sourced in yet, and if
not, then source it in. (I know of replace(), which works for

Here is what I have come up with.


junk.r contains the code for function thingy2().
This doesn't work: "missing value where logical needed"
The error message puzzles me.


Thanks very much for any help.

Bill Simpson

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