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Re: st: -syntax , option(varlist min=0)-?


From   Maarten buis <maartenbuis@yahoo.co.uk>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: -syntax , option(varlist min=0)-?
Date   Thu, 8 Oct 2009 19:53:56 +0000 (GMT)

--- On Thu, 8/10/09, Nick Winter wrote:
> program twoopts
>     syntax varlist , [  MYOPTion1
> MYOPTion2(varlist)  ]
>     
>     di
> "varlist:   [`varlist']"
>     di "myoption1: [`myoption1']"
>     di "myoption2: [`myoption2']"
>     
>     if "`myoption1'"!="" local myoption
> `varlist'
>     else if "`myoption2'"!="" local myoption
> `myoption2'
> 
>     di "myoption: [`myoption']"
> 
> end
> 
> This gives:
> 
> . twoopts mpg price
> varlist:   [mpg price]
> myoption1: []
> myoption2: []
> myoption: []
> 
> . twoopts mpg price , myopt(mpg)
> varlist:   [mpg price]
> myoption1: []
> myoption2: [mpg]
> myoption: [mpg]
> 
> . twoopts mpg price , myopt
> varlist:   [mpg price]
> myoption1: [myoption1]
> myoption2: []
> myoption: [mpg price]
> 
> 
> 
> This is documented somewhere, i think....

This trick is also discussed in the latest Stata Journal:

Nick Cox (2009) Stata tip 79: Optional arguments to options. 
The Stata Journal 9(3): 504.
http://www.stata-journal.com/article.html?article=pr0048

Hope this helps,
Maarten

--------------------------
Maarten L. Buis
Institut fuer Soziologie
Universitaet Tuebingen
Wilhelmstrasse 36
72074 Tuebingen
Germany

http://www.maartenbuis.nl
--------------------------



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