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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 15:57:27 -0700 |

Within Mata functions, variables need to be explicitly declared unless you -set matastrict off-. So under -set matastrict on-, you would need to declare each of the variables you use in your function on a separate line, before being able to use them. T On Wed, Aug 10, 2011 at 3:46 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/ >>>> >>> >>> * >>> * 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/ >>> >> >> * >> * 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/ >> > > * > * 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/

**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>

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