Re: st: AW: Quotes for scalar within local (was efficiently run three loops (or do without them))

[Ronnie Babigumira <rb.glists@gmail.com>]

Thanks Martin.

That it is not a recommended strategy tells me I am doing something "wrong" or that I need to be
careful. Might you know why it is not recommended.

Also, I am thinking that this revised code is closer to what Roy wrote only I like to put this kind
of stuff out of the the main body of the code so that I can easily change them (but I can live with
this anyway)

sysuse auto, clear
levelsof foreign, local(source)
foreach i of local source {
	levelsof rep78 if foreign == `i', local(rep)
		foreach j of local rep {
			g x = foreign == `i' & rep78 == `j'
			sum mpg if x
			drop x
			}
}

Martin Weiss wrote:
> <> 
>
> If you wanted to make the -local- work here, you would have to delay
> evaluation with the "\" character. This is not a recommended strategy, but
> note the difference here:
>
> *************
> sysuse auto, clear
> local x "foreign == `i' & rep78 == `j'"
> local y "foreign == \`i' & rep78 == \`j'"
> macro dir
> *************
>
>
>
> HTH
> Martin
>
> -----Ursprüngliche Nachricht-----
> Von: owner-statalist@hsphsun2.harvard.edu
> [mailto:owner-statalist@hsphsun2.harvard.edu] Im Auftrag von Ronnie
> Babigumira
> Gesendet: Dienstag, 14. April 2009 08:00
> An: statalist@hsphsun2.harvard.edu
> Betreff: st: Quotes for scalar within local (was efficiently run three loops
> (or do without them))
>
> Thanks
> Exploring your suggestion but wanting to put the checks in a macro rather
> than a variable, however,
> I am stuck (I have checked the archives but I cannot find a solution)
>
> An illustration using the auto data
>
> local x "foreign == `i' & rep78 == `j'"
> sysuse auto, clear
> levelsof foreign, local(source)
> foreach i of local source {
> 	levelsof rep78 if foreign == `i', local(rep)
> 		foreach j of local rep {
> 			sum mpg if `x'
> 			}
> }	
>
> I have set the trace on and this is where it fails
> - sum mpg if `x'
> = sum mpg if foreign ==  & rep78 ==
>
> Looks like the `i' and `j' disappear. I have fiddled around with different
> combinations of quotes
> but no luck.
>
> Ronnie
>
>
>
> Roy Wada wrote:
> > > gen check=1 if fup_pdt>`x' | fup_unit=`Y' | fup_qtycoll`x' & fup_unit=`Y'
> & fup_qtycoll
> > where x, y, z are some conditions to be met. Then you would list them,
> i.e.
> >  
> > list fup_pdt fup_unit if check==1
> >
> > And you'll know they aren't good at all.
> >  
> > _________________________________________________________________
> > Windows Live™: Keep your life in sync.
> > http://windowslive.com/explore?ocid=TXT_TAGLM_WL_allup_1a_explore_042009
> > *
> > *   For searches and help try:
> > *   http://www.stata.com/help.cgi?search
> > *   http://www.stata.com/support/statalist/faq
> > *   http://www.ats.ucla.edu/stat/stata/
>
> *
> *   For searches and help try:
> *   http://www.stata.com/help.cgi?search
> *   http://www.stata.com/support/statalist/faq
> *   http://www.ats.ucla.edu/stat/stata/
>
>
> *
> *   For searches and help try:
> *   http://www.stata.com/help.cgi?search
> *   http://www.stata.com/support/statalist/faq
> *   http://www.ats.ucla.edu/stat/stata/

*
*   For searches and help try:
*   http://www.stata.com/help.cgi?search
*   http://www.stata.com/support/statalist/faq
*   http://www.ats.ucla.edu/stat/stata/