Drawing Trig Function

Ben Bolker <ben at zoo.ufl.edu> writes:

if (FALSE) {}

around the stuff you want to comment out.
This won't work if you have open parentheses or other "syntax errors" in
the commented region.

..and if you use it to remove largish blocks in scripts fed to stdin,
you'll notice that it takes quit a lot of time. This is due to a
current silliness in the R parser: Whenever we see a newline, we check
whether the expression is complete. If so, then we evaluate it,
otherwise we *reparse* what has already been seen, adding another
line. This makes parsing O(k^2) in the number of lines in an
expression which is really unnecessary. It's just that noone has
figured out how to do the required checkpointing of the bison/yacc
parser yet. The effect doesn't happen when you source() files, because
in that case we always parse the entire file before executing it.

--
   O__  ---- Peter Dalgaard             Blegdamsvej 3
  c/ /'_ --- Dept. of Biostatistics     2200 Cph. N
 (*) \(*) -- University of Copenhagen   Denmark      Ph: (+45) 35327918
~~~~~~~~~~ - (p.dalgaard at biostat.ku.dk)             FAX: (+45) 35327907