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st: saving to locals in Mata


From   Kit Baum <[email protected]>
To   [email protected]
Subject   st: saving to locals in Mata
Date   Wed, 25 Apr 2007 11:41:53 -0400

sacrificial lamb

Julian said

I am having trouble saving to locals using Mata. The following ADO
code demonstrates my problem:

***example.ado code***

 	program example
 		version 9.2

 		mata: example()
 	end

 	mata:
 		void example()
 		{
 			t = "string"
 			st_local("my_local",t)
 			stata(`" di "my_local is `my_local'""')
 		}
 	end

***end example.ado code***


No problem if instead you include the line

    di "the local is `my_local'"

in the Stata program. It might be that the stata() function is
executed in a different context than that of the calling program (in
which my_local is local). For instance,

 	program example
 		version 9.2

 	local test test
 		mata: example()
 		di "the local is `my_local'"

 	end

 	mata:
 		void example()
 		{
 			t = "string"
 			st_local("my_local",t)
 			stata(`" di "my_local is `my_local'""')
 			stata(`" di "test is `test'""')
 		}
 	end

does not display the value of test within Mata, either, although it
is certainly defined in program example. But then why not just work
with my_local back in the Stata program, anyway?


Kit Baum, Boston College Economics and DIW Berlin
http://ideas.repec.org/e/pba1.html
An Introduction to Modern Econometrics Using Stata:
http://www.stata-press.com/books/imeus.html


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