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From |
Tirthankar Chakravarty <tirthankar.chakravarty@gmail.com> |

To |
statalist@hsphsun2.harvard.edu |

Subject |
Re: st: Mata and do files |

Date |
Wed, 10 Aug 2011 17:09:18 -0700 |

Ah, I see. Sorry about the mix-up then. T On Wed, Aug 10, 2011 at 5:06 PM, Nick Cox <njcoxstata@gmail.com> wrote: > Quite so, and I didn't say otherwise. I am replying to Alex's question > addressed to me of why I recommended that Alex use -tokens()-, which > is explicit below. > > I am pointing out that doing without -tokens()- does not work with > 10.1, but without experiment I can not be absolutely sure that > -st_view()- is not more indulgent in 11 or 12. > > Nick > > On Thu, Aug 11, 2011 at 12:57 AM, Tirthankar Chakravarty > <tirthankar.chakravarty@gmail.com> wrote: >> Nick, >> >> That does not appear to be the code I sent to the list in my (Wed, Aug >> 10, 2011 at 2:22 PM) posting. Here it is again: >> >> /******************************/ >> sysuse auto, clear >> capture mata mata drop theta() >> mata >> // mata set matastrict on >> mata set matastrict off >> >> // define theta() function >> 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() >> end >> /******************************/ >> >> T >> >> On Wed, Aug 10, 2011 at 4:36 PM, Nick Cox <njcoxstata@gmail.com> wrote: >>> I have 12, but it's at my workplace, and I'm not. >>> >>> . sysuse auto >>> (1978 Automobile Data) >>> >>> . mata >>> ------------------------------------------------- mata (type end to exit) ----- >>> : st_view(a = ., ., "price length weight") >>> variable price length weight not found >>> st_view(): 3500 invalid Stata variable name >>> <istmt>: - function returned error >>> r(3500); >>> >>> : end >>> ------------------------------------------------------------------------------- >>> >>> . about >>> >>> Stata/SE 10.1 for Windows >>> Born 10 Jun 2010 >>> >>> >>> On Thu, Aug 11, 2011 at 12:30 AM, Tirthankar Chakravarty >>> <tirthankar.chakravarty@gmail.com> wrote: >>>> 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. > > * > * For searches and help try: > * http://www.stata.com/help.cgi?search > * http://www.stata.com/support/statalist/faq > * http://www.ats.ucla.edu/stat/stata/ > -- Tirthankar Chakravarty tchakravarty@ucsd.edu tirthankar.chakravarty@gmail.com * * For searches and help try: * http://www.stata.com/help.cgi?search * http://www.stata.com/support/statalist/faq * http://www.ats.ucla.edu/stat/stata/

**Follow-Ups**:**Re: st: Mata and do files***From:*Nick Cox <njcoxstata@gmail.com>

**References**:**st: Mata and do files***From:*Alex Olssen <alex.olssen@gmail.com>

**Re: st: Mata and do files***From:*Nick Cox <njcoxstata@gmail.com>

**Re: st: Mata and do files***From:*Alex Olssen <alex.olssen@gmail.com>

**Re: st: Mata and do files***From:*Nick Cox <njcoxstata@gmail.com>

**Re: st: Mata and do files***From:*Alex Olssen <alex.olssen@gmail.com>

**Re: st: Mata and do files***From:*Nick Cox <njcoxstata@gmail.com>

**Re: st: Mata and do files***From:*Tirthankar Chakravarty <tirthankar.chakravarty@gmail.com>

**Re: st: Mata and do files***From:*Nick Cox <njcoxstata@gmail.com>

**Re: st: Mata and do files***From:*Tirthankar Chakravarty <tirthankar.chakravarty@gmail.com>

**Re: st: Mata and do files***From:*Nick Cox <njcoxstata@gmail.com>

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