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From |
"Martin Weiss" <martin.weiss1@gmx.de> |

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

Subject |
st: RE: do-files as programs |

Date |
Thu, 25 Sep 2008 18:52:58 +0200 |

-set rmsg on- or -h profiler- to be sure. Once the -program- has been read once, Stata holds it in memory (-pr dir- to see that) so I do not find this surprising at all... HTH Martin -----Original Message----- From: owner-statalist@hsphsun2.harvard.edu [mailto:owner-statalist@hsphsun2.harvard.edu] On Behalf Of Gabi Huiber Sent: Thursday, September 25, 2008 6:48 PM To: statalist@hsphsun2.harvard.edu Subject: st: do-files as programs I am comparing two ways to solve the same problem and I can't see why one of them runs more quickly, but it looks that way. Is there any reason why do-files declared as programs might run faster? Suppose you have a do-file call another a few times, inside a loop, like so: _____ example 1 starts here // this is my main file forvalues i=1/`numberoftimes' { [declare some parameters as globals] do mysubfile.do // uses the set of parameters declared above } _____ example 1 ends here In example 1, mysubfile.do is just a sequence of Stata commands. Now suppose that you edit mysubfile.do with these lines ___ capture prog drop mySubfile prog def mySubfile [content of old mysubfile.do goes here] end ___ This will then require that you run the code in example 1 as follows: _____ example 2 starts here // this is my main file do mysubfile.do forvalues i=1/`numberoftimes' { [declare some parameters as globals] mySubfile // uses the set of parameters declared above } _____ example 2 ends here It seems to me that example 2, while slightly more work to write up, runs noticeably faster. Am I imagining things? Thank you, Gabi * * 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/

**References**:**st: do-files as programs***From:*"Gabi Huiber" <ghuiber@gmail.com>

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