RE: st: RE: about macro's double quotes

["Martin Weiss" <martin.weiss1@gmx.de>]

<>

I would be surprised if Stata indeed complained about "r5pnhm5y", I guess it
complains about "r5pnhm5". Second time through the inner loop, you want
Stata to refuse to -generate- because the -if- expression is not satisfied,
but Stata does still (try to) -generate-, and fill the new var with missings
- due to the -if-...


***
clear*
set obs 100

local set "md me"

foreach el in `set'{
	gen x`el'=1 if "`el'"=="md"
}
***

HTH
Martin


-----Original Message-----
From: owner-statalist@hsphsun2.harvard.edu
[mailto:owner-statalist@hsphsun2.harvard.edu] On Behalf Of G. Dai
Sent: Dienstag, 9. März 2010 21:48
To: statalist@hsphsun2.harvard.edu
Subject: Re: st: RE: about macro's double quotes

thanks for the reference, Martin.
yeah, the outer loop is redundant. But I do want to know why that "if"
doesn't work.  it is wired to a beginner...

On Tue, Mar 9, 2010 at 12:20 PM, Martin Weiss <martin.weiss1@gmx.de> wrote:

>
> <>
>
> If you want to read up on -macro-s, check out manual [U], section 18.3.
>
> What do you want to achieve with your outer loop? You let it cycle through
> three elements of a -global-. The -gen- and -replace- statements inside
the
> second loop are supposed to be executed only for the first element of the
> -global-. Would it not be much easier to drag the -gen-/-replace-
statement
> out of the inner loop, and ditch the outer one? Maybe this is taken out of
> context, but from what is visible in your post, the outer loop is
> redundant...
>
>
> HTH
> Martin
>
>
> -----Original Message-----
> From: owner-statalist@hsphsun2.harvard.edu
> [mailto:owner-statalist@hsphsun2.harvard.edu] On Behalf Of G. Dai
> Sent: Dienstag, 9. März 2010 20:20
> To: statalist@hsphsun2.harvard.edu
> Subject: st: about macro's double quotes
>
> dear all,
> I'm a first time  user of macros. As you can see from below, I want to
> generate a  new var r`i'pnhm when x=md.  After execute the do file, it
> runs smoothly for x=md. After that, however, I was always reminded by
STATA
> that
>               r5pnhm5y already defined
>               r(110);
> so what's wrong with the following program. BTW,I'm little bit confused by
> the macro
> quotes, can anyone say tips?
> regards,
> Guang
>
>
>
> global set "md mom dad";
> foreach x in $set {;
> forvalues i=5/8{;
> gen r`i'pnhm=. if "`x'"=="md";
> replace r`i'pnhm=int(10*r`i'pnhm5y)/10 if "`x'"=="md";
> ....
> };
>
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