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Re: st: Mata and do files


From   Tirthankar Chakravarty <tirthankar.chakravarty@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: Mata and do files
Date   Wed, 10 Aug 2011 16:30:30 -0700

Nick,

I don't have 12 either. That code was from a fully-updated 11.2.

However, I have just checked with my 10.1 and it seems to go through
without problems.

T

On Wed, Aug 10, 2011 at 3:57 PM, Nick Cox <njcoxstata@gmail.com> wrote:
> It didn't work for me in Stata 10.1. (My machine with Stata 12 is a mile away.)
>
> Nick
>
> On Wed, Aug 10, 2011 at 11:46 PM, Alex Olssen <alex.olssen@gmail.com> wrote:
>> 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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>



-- 
Tirthankar Chakravarty
tchakravarty@ucsd.edu
tirthankar.chakravarty@gmail.com

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