On Tue, Apr 26, 2005 at 05:22:42PM -0400, Roger D. Peng wrote:
> I realize this thread is a bit old, but it only just came to my
> mind. What about using a function like
>
> commentOut <- function(expr) { invisible() }
>
> and then
>
> commentOut({
> a <- 10
> bladfkljasdlkfj()
> blah blah blah
> })
>
> Lazy evaluation prevents the expression from being evaluated so
> you don't have to worry about syntatic correctness. And it nests
> too (I believe).
This doesn't work too well, unfortunately. Firstly the argument(s) of
commentOut are still parsed, so if there is a syntax error (which creates
a problem during parsing), execution is halted. Furthermore, while
a series of statements (separated by newlines or semicolons) is not
acceptable as a function argument, so this approach is limited to
commenting out pieces that represent single expressions.
Best regards, Jan
--
+- Jan T. Kim -------------------------------------------------------+
| *NEW* email: [EMAIL PROTECTED] |
| *NEW* WWW: http://www.cmp.uea.ac.uk/people/jtk |
*-----=< hierarchical systems are for files, not for humans >=-----*
______________________________________________
R-devel@stat.math.ethz.ch mailing list
https://stat.ethz.ch/mailman/listinfo/r-devel
