Re: st: Re:Obtaining varlist from other dataset

[Keith Dear <keith.dear@anu.edu.au>]

That's one of the glories of Stata - there's ALWAYS a better way :)
Cheers Phil,
Keith

At 06:59 PM 2/02/2008, you wrote:
> Another approach:
>
> local myvars `r(varlist)'
>
> also works. The left-single-quote, right-single-quote construct expands the
> macro (to yield the list of variable names) and then copies those names to
> myvars.
>
> This may have advantages over Keith's solution, as evaluation and 
> assignment (ie
> using "=") will break down if the variable list, and hence the 
> string length of
> the list, gets beyond 244.  This limitation does not apply to expansion and
> copying.
>
> Phil
>
>
>
>
>
>
>
>
> Quoting "P. Wilner Jeanty" <pwjeanty@gmail.com>:
>
> > On Feb 2, 2008 12:57 AM, Keith Dear <keith.dear@anu.edu.au> wrote:
> > > David,
> > > Wilner is right, the varlist option does solve your problem. But the
> > statement:
> > > . local myvars r(varlist)
> > > merely assigns the string "r(varlist)" to the macro, which therefore
> > > contains only one word.
> > > You can verify this with
> > > . display "`myvars'"
> > > r(varlist)
> > >
> > > You can get what you need like this:
> > > . describe using my_file, varlist
> > > . local myvars=r(varlist)       // "=" inserted
> > > . display "`myvars'"
> > > x1 x2 x3 x4
> > >
> > > The "=" has the effect of *evaluating* r(varlist), and assigning the
> > > result to myvars.
> > > Keith
> >
> > David's problem is indeed solved. Not only can he put all the
> > variables in a macro, he can also put them in separate macros. As
> > Keith clarified, the "=" sign solved the problem of extended macro
> > function manipulation.
> > --
> > P. Wilner Jeanty, Post-doctoral researcher
> > Dept. of Agricultural, Environmental, and Development Economics
> > The Ohio State University
> > 2120 Fyffe Road
> > Columbus, Ohio 43210
> > (614) 292-6382 (Office)
> > *
> > *   For searches and help try:
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> > *   http://www.stata.com/support/statalist/faq
> > *   http://www.ats.ucla.edu/stat/stata/
> >
>
>
> --
> Philip Ryan
> Professor
> Discipline of Public Health
>
> Director, Data Management and Analysis Centre
> Associate Dean (IT)
> Faculty of Health Sciences
>
> University of Adelaide
> 5005 South Australia
> AUSTRALIA
> CRICOS Provider Number 00123M
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