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Re: st: Loops in Mata


From   Nick Cox <njcoxstata@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: Loops in Mata
Date   Wed, 26 Jan 2011 10:18:48 +0000

As far as Mata is concerned, it looks as if you are asking it to do
the same calculation 379 times on a variable called -Pi-.

You want Mata to cycle over 379 different variables, which is a very
different problem. It's probably better to read in all the data at
once to a  matrix, then loop over the column vectors.

Nick

On Wed, Jan 26, 2011 at 10:08 AM, gsborker <gsborker@gmail.com> wrote:

> I am trying to do the following in mata
>
> mata
>
>        for (i=1; i<=379; i++) {
>
>                xi = st_data(.,"Pi") ;
>                yi = (xi)' ;
>                polyroots(yi) ;
>
>                }
> end
>
> where P* are (674x1) column vectors. I am trying to run the "polyroots"
> command 379 times on (1x674) row vectors. This is not working and I'm
> getting recurrent errors.

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