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: [email protected] [mailto:[email protected]]On Behalf Of Ronnie Babigumira
Sent: woensdag 30 mei 2007 17:46
To: [email protected]
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: [email protected] [mailto:[email protected]]On Behalf Of Ronnie Babigumira
> Sent: woensdag 30 mei 2007 16:35
> To: [email protected]
> 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
> *
> * For searches and help try:
> * http://www.stata.com/support/faqs/res/findit.html
> * http://www.stata.com/support/statalist/faq
> * http://www.ats.ucla.edu/stat/stata/
>
> *
> * For searches and help try:
> * http://www.stata.com/support/faqs/res/findit.html
> * http://www.stata.com/support/statalist/faq
> * http://www.ats.ucla.edu/stat/stata/
>
*
* For searches and help try:
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* http://www.stata.com/support/statalist/faq
* http://www.ats.ucla.edu/stat/stata/
*
* For searches and help try:
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* http://www.ats.ucla.edu/stat/stata/
