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Re: st: mata orgtype


From   Nick Cox <njcoxstata@gmail.com>
To   "statalist@hsphsun2.harvard.edu" <statalist@hsphsun2.harvard.edu>
Subject   Re: st: mata orgtype
Date   Tue, 23 Apr 2013 08:19:23 +0100

I don't recall seeing this varying behaviour, but then again I don't
think I have ever tried this.

I think we'd need a reproducible example to comment.

Meanwhile, the main purpose of -levelsof- was, and is, to make
analyses easier in Stata. A near equivalent in Mata is to apply
-uniqrows()- to variables read in as vectors. I'd expect that to be
faster too.

Nick
njcoxstata@gmail.com


On 23 April 2013 00:29, Tomáš Houška <xbender@gmail.com> wrote:

> I have a Stata macro generated by -levelsof- and I am trying to parse
> it in mata with -tokens- so that I can run mata loops with it...
> example:
>
> levelsof product, local(product_id)
> mata
> prods=tokens(st_local("product_id"))
> for(i = 1; i<=length(prods); i++) {
> ... commands including prods[i] ...
> }
> end
>
> My problem is that on some types of variables, the resulting mata item
> (in this case "prods") is a row vector, but sometimes it is a scalar
> string. Once it is a scalar string, I cannot refer to items on
> individual positions by -prods[i]- as I can do when it is a row
> vector.
> Is there a rule to which type gets created and when? Or is there a way
> to make sure that row vector  gets created?

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