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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 10:46:05 +1200

Thanks for the help!

Tirthankar your solution works perfectly - the code works
interactively and from a do file.

One question though, could you explain to me why I need to turn matastrict off?

Nick, you said "price length weight" is not an acceptable argument for
-st_view()- however typing the following interactively in a new Stata
session suggests otherwise.

sysuse auto, clear
mata
st_view(a=., ., "price length weight")
a

Am I missing something?

Cheers,
Alex

On 11 August 2011 09:23, Nick Cox <njcoxstata@gmail.com> wrote:
> "price length weight" is not an acceptable argument for -st_view()-.
> You need to tokenize it.
>
> I imagine that the do-file approach requires you to leave Mata with an
> -end- statement.
>
> Nick
>
> On Wed, Aug 10, 2011 at 10:14 PM, Alex Olssen <alex.olssen@gmail.com> wrote:
>> 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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