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st: RE: Using Mata within a foreach loop = r(1)


From   "Nick Cox" <n.j.cox@durham.ac.uk>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: RE: Using Mata within a foreach loop = r(1)
Date   Thu, 6 Dec 2007 23:47:03 -0000

My guess is that you have to respect much more the fact
that Stata and Mata are different languages. I don't think 
you can mix them quite like this. 

Something like 

foreach ... { 
	...
	myprog ...
	... 	
} 

where -myprog- is a Stata program that calls Mata is more likely
to succeed. 

As your real problem is different, further advice may wait upon 
details. 

Pablo Mitnik

When I try to do stuff in Mata within a loop, in a do file, I receive 
the following error message:

--Break--
r(1);

end of do-file

--Break--
r(1);

I looked up r(1), and it says:

[P]     error . . . . . . . . . . . . . . . . . . . . . . . . .  Return 
code 1
        You pressed Break.  This is not considered an error.

(Of course, I don't press break while the loop is executing.)

The following very simple loop reproduces the error I get

foreach i in 1 2 {
mata:
A=1,2
A
mata clear
end
}

Any clue about what my mistake is?

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