On 03/09/17 03:56, William Dunlap via R-help wrote:
Is the reason you want a block comment containing code (as opposed to
arbitrary text) that you want to be able to easily run the commented out
code? If so the 'if()' construct has the advantage that you only need to
change code at the start of the comment, not at both ends.
The if(FALSE) could be if(isTRUE(getOption("DEBUG_ISSUE_XYZ"))) so you
would not even have to change code to re-enable the debugging code, just
call options(DEBUG_ISSUE_XYX=TRUE)).
(a) The foregoing is getting too subtle for my feeble brain.
(b) A fundamental problem with the
if(FALSE) {
...
}
paradigm is that the enclosed code must be syntactically valid, and
there are certainly situations in which one might wish to comment out
sections of code that are *not* syntactically valid. E.g. one might
wish to comment out *part* of a piece of syntactically valid code for
the purpose of experimenting with an alternative approach.
cheers,
Rolf
--
Technical Editor ANZJS
Department of Statistics
University of Auckland
Phone: +64-9-373-7599 ext. 88276
On Sat, Sep 2, 2017 at 7:54 AM, Suzen, Mehmet <msu...@gmail.com> wrote:
AFAIK block comment is not possible
it needs to be implemented in R interpreter and defined in the
parser.'If' solution is not elegant.
On 2 September 2017 at 14:09, Uwe Ligges
<lig...@statistik.tu-dortmund.de> wrote:
On 02.09.2017 11:40, Christian wrote:
I consider it quite worth while to introduce into R syntax a nestable
block comment like
#{
<block of code>
}#
if(FALSE){
<block of code>
}
Best,
Uwe Ligges
It would make documentation more easily manageable and lucid.
Is there considerable need for this.
Please, comment on this.
How about R core?
Christian
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