Notice: On March 31, it was **announced** that Statalist is moving from an email list to a **forum**. The old list will shut down on April 23, and its replacement, **statalist.org** is already up and running.

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

From |
William Buchanan <william@williambuchanan.net> |

To |
"statalist@hsphsun2.harvard.edu" <statalist@hsphsun2.harvard.edu> |

Subject |
Re: st: STATA 12 very slow compared to STATA 10 |

Date |
Tue, 12 Mar 2013 10:13:51 -0700 |

-h mata- There absolutely is support for looping procedures in mata, they just use a different syntax. Sent from my iPhone On Mar 12, 2013, at 9:46, Sara Borelli <saraborelli77@gmail.com> wrote: > Nick, > > thank you very much for your suggestions > > I did not use Mata before, I tried to play around with it but it seems > it cannot be combined with loop... > Since I have several loops in my program, would you have an example or > suggestion of how I could implement some of my program using Mata and > in loop? > > Thanks for any input you might have > > Sara > > > On Tue, Mar 12, 2013 at 10:29 AM, Nick Cox <njcoxstata@gmail.com> wrote: >> Maarten [NB] understated the difficulty for everyone but you, as the >> speed of Stata [NB] can depend on what else is running, how much >> memory is available, etc., etc. >> >> A quite different comment is what are you doing here and why? I see >> lots of pushing variables in and out of Stata matrices and some >> bootstrap sampling, so four points as you are worried about speed. >> >> 0. I see no point in using Stata matrices for storing data unless you >> want to do matrix manipulations. >> >> 1. Mata matrices are faster than Stata matrices. That was true in Stata 10 too. >> >> 2. When bootstrapping, it seems easiest to hold each sample in memory >> once, process it and then throw it away. >> >> 3. -mmerge- [source not given, but last updated on SSC in 2002?] is >> long since superseded by a revised -merge-. >> >> Naturally I can't comment on the rest of the program. >> >> Nick >> >> On Tue, Mar 12, 2013 at 1:40 PM, Sara Borelli <saraborelli77@gmail.com> wrote: >>> Hi Martin >>> you are right, I did not ask the question correctly. I thought there >>> was maybe a common problem for STATA 12 being slow in general that >>> others might have encountered. I apologize for that >>> >>> I write here below an extract of the program I am running. If you have >>> any insight of what is going wrong I would really appreciate it. I >>> also tried to run the entire program using "version 10" at the >>> beginning of the do file, but it is still very slow >>> I let the program run all night but is still not done. When I was >>> using STATA 10 it was taking only 15 minutes overall >>> >>> >>> before this "mat define" command line I am running some glm estimation >>> that works at usual speed >>> >>> mat define P=J(618,1,.) >>> >>> set seed 55982264 >>> >>> forvalues x=1/500 { >>> >>> mat define BS_r`x'=J(618,1,.) >>> >>> use data1 >>> for each var of varlist v1 v2 v3 v4 ....v10 { >>> bsample >>> mkmat `var', mat(Z_`var'_r`x') >>> mat BS_r`x'=BS_r`x',Z_`var'_r`x' >>> } >>> drop v1-v10 >>> svmat BS_r`x', names(col) >>> gen id=_n >>> save BS_r`x', replace >>> >>> use data2, clear >>> gen id=_n >>> mmerge id using BS_r`x' >>> save replication `x' >>> predict prediction`x' >>> mkmat prediction`x', mat(P_`x') >>> mat P=P, P_`x' >>> } >>> >>> It seem to run smoothly until the "predict", but seems to get slow at >>> the time of running the command mkmat prediction`x', mat(P_`x') >>> >>> thanks for any insight you might have >> * >> * For searches and help try: >> * http://www.stata.com/help.cgi?search >> * http://www.stata.com/support/faqs/resources/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/faqs/resources/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/faqs/resources/statalist-faq/ * http://www.ats.ucla.edu/stat/stata/

**Follow-Ups**:**Re: st: STATA 12 very slow compared to STATA 10***From:*Maarten Buis <maartenlbuis@gmail.com>

**References**:**st: STATA 12 very slow compared to STATA 10***From:*Sara Borelli <saraborelli77@gmail.com>

**Re: st: STATA 12 very slow compared to STATA 10***From:*Maarten Buis <maartenlbuis@gmail.com>

**Re: st: STATA 12 very slow compared to STATA 10***From:*Sara Borelli <saraborelli77@gmail.com>

**Re: st: STATA 12 very slow compared to STATA 10***From:*Nick Cox <njcoxstata@gmail.com>

**Re: st: STATA 12 very slow compared to STATA 10***From:*Sara Borelli <saraborelli77@gmail.com>

- Prev by Date:
**Re: st: STATA 12 very slow compared to STATA 10** - Next by Date:
**Re: st: Simulating Multinomial Logit in Stata** - Previous by thread:
**Re: st: STATA 12 very slow compared to STATA 10** - Next by thread:
**Re: st: STATA 12 very slow compared to STATA 10** - Index(es):