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Re: st: regexr string function very slow in Stata13


From   Nicola Tommasi <nicola.tommasi@univr.it>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: regexr string function very slow in Stata13
Date   Fri, 13 Dec 2013 12:28:23 +0100

Yes, I'm using the same flavor (Stata13.1  MP 64 bit 4 processor)

Nicola



Il 13/12/2013 12:15, William Buchanan ha scritto:
Are you using the same flavor of Stata across the two versions?  I regularly need to use regular expressions to clean up strings and haven't noticed any differences between MP versions, but did notice speed differences between v 12MP2 and v 13SE.

Sent from my iPhone

On Dec 13, 2013, at 4:28, Nick Cox <njcoxstata@gmail.com> wrote:

Depends what the question is, really. But you're showing that Stata 13
is slower at the same job than Stata 12. That's, I guess, an undesired
side-effect of rewriting string functions to cope with long strings,
even if you don't have long strings.
Nick
njcoxstata@gmail.com


On 13 December 2013 10:20, Nicola Tommasi <nicola.tommasi@univr.it> wrote:
Hi all
On my computer they are installed Stata12 and Stata13, but regexr function
run very slowly in Stata13. Here a log file
Any idea?



. count;
730649

. di "`c(stata_version)' - `c(os)' - `c(osdtl)' - `c(machine_type)' -
`c(processors)'";
13.1 - Windows - 64-bit - PC (64-bit x86-64) - 4

. timer on 1;

. gen var2 = regexr(var1,"<[^<>]+>","");

. timer off 1;

. timer list 1;
   1:     54.88 /        1 =      54.8830

. timer on 2;

. replace var2 = regexr(var2,"<[^<>]+>","");
(730649 real changes made)

. timer off 2;

. timer list 2;
   2:     54.14 /        1 =      54.1400





. count;
730649

. di "`c(stata_version)' - `c(os)' - `c(osdtl)' - `c(machine_type)' -
`c(processors)'";
12.1 - Windows - 64-bit - PC (64-bit x86-64) - 4

. timer on 1;

. gen var2 = regexr(var1,"<[^<>]+>","");

. timer off 1;

. timer list 1;
   1:      1.43 /        1 =       1.4300

. timer on 2;

. replace var2 = regexr(var2,"<[^<>]+>","");
(730649 real changes made)

. timer off 2;

. timer list 2;
   2:      0.49 /        1 =       0.4860




--
_______________________________________________________________________
dott. Nicola Tommasi
Centro Interdipartimentale di Documentazione Economica (C.I.D.E)
University of Verona
via dell'Artigliere, 19
37129 Verona (Italy)
tel.: +39-045-8028048
fax.: +39-045-8028047
Skype: nicola.tommasi
________________________________________________________________________

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--
_______________________________________________________________________
dott. Nicola Tommasi
Centro Interdipartimentale di Documentazione Economica (C.I.D.E)
University of Verona
via dell'Artigliere, 19
37129 Verona (Italy)
tel.: +39-045-8028048
fax.: +39-045-8028047
Skype: nicola.tommasi
________________________________________________________________________

*
*   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/


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