On Aug 20, 2009, at 1:19 PM, Duncan Murdoch wrote:
On 8/20/2009 11:54 AM, Steve Jaffe wrote:
Why not
if ( 0 ) {
commented with zero
} else {
commented with one
}
But an extremely simple modification "succeeds":
if ( 0 ) {"
commented with zero
"} else {"
commented with one
"}
Returns:
[1] "\ncommented with one\n"
If bothered by the \n's then the ""'s could be on the same line as the
comment
--
David Winsemius
Because that doesn't work unless the comments are syntactically
correct R. For example, yours gives:
Error in source("clipboard") : clipboard:2:11: unexpected symbol
1: if ( 0 ) {
2: commented with
^
In C++, you can put nearly arbitrary junk in the #if 0 block, and it
will be stripped by the preprocessor.
Duncan Murdoch
Greg Snow-2 wrote:
I believe that #if lines for C++ programs is handled by the
preprocessor,
not the compiler. So if you want the same functionality for R
programs,
it would make sense to just preprocess the R file.
In C++, I can use the following construct to choice either of the
two
blocks the comment but not both. Depending on whether the number
after
"#if" is zero or not, the commented block can be chose. I'm
wondering
if such thing is possible in R?
#if 0
commented with 0
#else
commented with 1
#endif
Regards,
Peng
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David Winsemius, MD
Heritage Laboratories
West Hartford, CT
______________________________________________
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