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Re: st: Mata and do files


From   Nick Cox <njcoxstata@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: Mata and do files
Date   Wed, 10 Aug 2011 12:54:01 +0100

It's not Stata that bounces your emails; it's Statalist!

Try

 tokens("price length weight")

Nick

On Wed, Aug 10, 2011 at 12:39 PM, Alex Olssen <alex.olssen@gmail.com> wrote:
> Hi everyone,
>
> Apologies to anybody who gets this message twice - I just got an email
> from Stata telling me my first message was bounced.  I checked the
> archive and it doesn't appear to have arrived correctly.  In any
> case...
>
> I am trying to learn some Mata and am having difficult running Mata
> code from a do file.
>
> For example I can use the following code interactively, but if I try
> run it from the do-file editor I get error r(3000).  I have looked
> around for an answer in [M] and the Statalist archives to no avail.
>
> sysuse auto, clear
> mata
> real scalar theta()
> {
> st_view(a = ., ., "price length weight")
> a_cov = variance(a)
> a_eigen = symeigensystem(a_cov, X = ., L = .)
> return(L[1]/sum(L))
> }
> theta()
>
> Any help would be greatly appreciated.

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