Re: st: RE: new local macro from results of loop

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

My aha moment

Thank you both for the examples. Most illuminating

Ronnie

Maarten Buis wrote:
> the logic is that if a local doesn't yet exists it will 
> return nothing. How it works is best shown in an example:
>
> *--------------- begin example -----------
> di `foo'
> local foo `foo'
> di `foo'
> local foo `foo' 1
> di `foo'
> local foo `foo' 2
> di `foo'
> *--------------- end example --------------
> (For more on how to use examples I sent to the Statalist, see
> http://home.fsw.vu.nl/m.buis/stata/exampleFAQ.html )
>
> Hope this helps,
> Maarten
>
> -----------------------------------------
> Maarten L. Buis
> Department of Social Research Methodology 
> Vrije Universiteit Amsterdam 
> Boelelaan 1081 
> 1081 HV Amsterdam 
> The Netherlands
>
> visiting address:
> Buitenveldertselaan 3 (Metropolitan), room Z434 
> +31 20 5986715
>
> http://home.fsw.vu.nl/m.buis/
> -----------------------------------------
>
> -----Original Message-----
> From: owner-statalist@hsphsun2.harvard.edu [mailto:owner-statalist@hsphsun2.harvard.edu]On Behalf Of Ronnie Babigumira
> Sent: woensdag 30 mei 2007 17:46
> To: statalist@hsphsun2.harvard.edu
> Subject: Re: st: RE: new local macro from results of loop
>
> Thanks Nick and Maarten
>
> Both of your suggestions work (they look the same save for the "" in Maartens solution). That said, I have missed the
> obvious so I will ask that you help me with the logic
>
> My part of the loop goes through each element and does my stuff
>
> foreach v of local lvstk {
>         --my stuff--
>        
> How exactly does your part work
>         local lvstknos "`lvstknos' `v'nbeg `v'nend"
>         local new `new' `v'nbeg `v'nend
>
> It appears that you are each amending a new local (part of my confusion is that this new local has not been initialised
> before). My other problem is that I don't see the part that instructs Stata to incrementally build the new local
>
> Again, your solutions both work . I just want to understand the logic
>
> Many thanks
>
> Ronnie
>
> Maarten Buis wrote:
>
> > foreach v of local lvstk {
> >     egen `v'nbeg = sum(liv_begnum) if `v', by(houscode qtr)
> >     egen `v'nend = sum(liv_endnum) if `v', by(houscode qtr)
> >     local lvstknos "`lvstknos' `v'nbeg `v'nend"
> > }
> >
> > Hope this helps,
> > Maarten
> >
> > NB notice the absence of the equal sign in the local
> > statement, this will protect you against strings that
> > are too long.
> >
> > -----------------------------------------
> > Maarten L. Buis
> > Department of Social Research Methodology
> > Vrije Universiteit Amsterdam
> > Boelelaan 1081
> > 1081 HV Amsterdam
> > The Netherlands
> >
> > visiting address:
> > Buitenveldertselaan 3 (Metropolitan), room Z434
> >
> > +31 20 5986715
> >
> > http://home.fsw.vu.nl/m.buis/
> > -----------------------------------------
> >
> > -----Original Message-----
> > From: owner-statalist@hsphsun2.harvard.edu [mailto:owner-statalist@hsphsun2.harvard.edu]On Behalf Of Ronnie Babigumira
> > Sent: woensdag 30 mei 2007 16:35
> > To: statalist@hsphsun2.harvard.edu
> > Subject: st: new local macro from results of loop
> >
> > Dear list
> >
> > I define a local macro lvstk below which contains variables I would like to process further. For example
> >
> > local lvstk "cattle largeanims calves smallrums smallanims"
> >
> > foreach v of local lvstk {
> >         egen `v'nbeg = sum(liv_begnum) if `v', by(houscode qtr)
> >         egen `v'nend = sum(liv_endnum) if `v', by(houscode qtr)
> > }
> >
> > how do I automatically put the new variables being generated into a new macro
> >
> > say
> >
> > local lvstknos "cattlenbeg cattlenend ....and-all-the-other-stuff-coming-out-of-the-foreach-loop"
> >
> > Ronnie
> > *
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> >
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