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


From   Pablo Mitnik <pmitnik@ssc.wisc.edu>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: RE: Using Mata within a foreach loop = r(1)
Date   Fri, 07 Dec 2007 08:08:35 -0600

This is rather inconvenient when you have a longer code to run in Mata; and I haven't found any explanation in the manuals why the code with "mata" and "end" shouldn't work -- my bet is that this is a bug. Anyway, thanks Abdel and Nick for the workaround.
Pablo

Nick Cox wrote:

Abdel was quite correct to leave out an -end- statement. His example was a series of separate invocations of Mata.
Pablo Mitnik

Thanks for your answer -- but observe you left the end statement out. I
want to get out of Mata and continue doing stuff in the loop. When you
add the end command, the error I described is generated.
Pablo

Abdel Rahmen El Lahga wrote:

I don't understand your loop but the code below work *===================== foreach i in 1 2 {
mata: A=1,2
mata: A
mata: mata clear
}
*======================

2007/12/7, Nick Cox <n.j.cox@durham.ac.uk>:

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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--
Pablo A. Mitnik
University of Wisconsin-Madison (http://www.wisc.edu/ )
Department of Sociology ( http://www.ssc.wisc.edu/soc/)
Center on Wisconsin Strategy (http://www.cows.org/ )
1180 Observatory Drive
Room 7114A
Madison, WI 53706
TEL (608) 2621839
E-mail: pmitnik@ssc.wisc.edu

*
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