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Re: st: comment out a number of lines together


From   "Sergiy Radyakin" <serjradyakin@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: comment out a number of lines together
Date   Tue, 30 Sep 2008 15:12:26 -0400

Nick,

local c //
will not work in the program because "//" is interpreted as the start
of the comment
it works in the command line though, because "//"-style comments are
prohibited in the command line input. To fix this:
1) open quotes before // like so: local c "//" , or
2) write it down as an expression, e.g. local c="/"+"/"
In any case, Stata fails to recognize "//" as a comment when it comes
as a result of macro expansion. But it works for a star ("*").

// --- begin of file testc.do ---
local c //
display `"`c'"'
local c ="/"+"/"
display `"`c'"'
local c "//"
display `"`c'"'
local c "*"
display `"`c'"'
 `c' just nothing
local c "//"
 `c' just nothing
// --- end of file testc.do ---

If writing out debugging messages, it may be more comfortable to use
di_g. See: help di_g.

Best regards, Sergiy Radyakin



On Tue, Sep 30, 2008 at 11:28 AM, Nick Cox <n.j.cox@stata.com> wrote:
> Another is to prefix lines by e.g.
>
> `c'
>
> Setting
>
> local c *
>
> or
>
> local c //
>
> comments out those lines.
>
> Setting
>
> local c
>
> zaps the macro.
>
> Naturally any definition of the local as "*" or "//" must precede all uses
> that require that interpretation.
>
> The converse does not apply: if the local is not defined, Stata sees the
> line.
>
> More generally, you can define or undefine the macro at will.
>
> I don't especially recommend this method, but it is an alternative that is
> sometimes useful, and it matches practices in many programming languages.
>
> Nick
> n.j.cox@durham.ac.uk
>
>
> Maarten buis wrote:
>>
>> --- Paul O'Brien <paul.obrien@afe2.org.uk> wrote:
>>
>>> at times i need to comment out a number of lines, usually with * and
>>> remove the * later to activate the commands.
>>> is there a simple way to remove and add the * to a number of line at one
>>> go?
>>
>> One way to comment out a block of code is to surround them with /* and
>> */ this way you have to remove only these two.
>
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