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RE: 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   RE: st: RE: Using Mata within a foreach loop = r(1)
Date   Fri, 7 Dec 2007 15:39:08 -0000

That's a good question. 

I am working backwards from the fault. 

If your -end- were being treated as you intended, as a Mata 
statement, it would seem quite legal as such and there would be 
no error message, and no problem. 

Manifestly this is not happening. So what is happening? Your 
-end- is being misinterpreted, so far as you are concerned, 
and treated as a Stata statement. That's my diagnosis, and 
evidently Maarten's too. 

In general I am wary of calling anything a bug until I clearly 
understand it to be such, and that view still applies for me 
here until I hear otherwise. 

The territory we are in may arise from the fact, as I understand 
it, that -for*- loops in a sense define a kind of "program". 
Within such contexts, -end- may be ambiguous. 

Stata's rules evidently yield a Stata interpretation for -end- 
in your code, and that's your problem. 

(At one point, Mata ended with -mend-, but that didn't follow 
through to release, and that decision is not reversible.) 

There is some guesswork here. We need a StataCorp resolution. 

Pablo Mitnik

Nick Cox wrote:
> The answer to your 2 is Yes, with some exceptions for good reasons, as

> when you call Stata from Mata, but that is not the issue as I 
> understand it.
>
> The issue is that at that point in your code you are back in Stata and

> so (in context) -end- is illegal.
>   

Why am I back in Stata at this point?



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