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Re: st: Mata and do files


From   Alex Olssen <alex.olssen@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: Mata and do files
Date   Thu, 11 Aug 2011 09:14:04 +1200

Dear Nick,

You are absolutely correct - it was Statalist.

I am not sure what you mean by "try tokens("price length weight")."

I looked at the help file and then tried the following, which again
works interactively but not from a do file...

sysuse auto, clear
mata
real scalar theta()
{
st_view(a = ., ., tokens("price length weight"))
a_cov = variance(a)
a_eigen = symeigensystem(a_cov, X = ., L = .)
return(L[1]/sum(L))
}
theta()

Any ideas?

On 10 August 2011 23:54, Nick Cox <njcoxstata@gmail.com> wrote:
> 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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>

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