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Re: st: RE: Using Mata within a foreach loop = r(1)
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 <[email protected]>:
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: [email protected]
*
* 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/