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Re: st: regexr string function very slow in Stata13
From
Nicola Tommasi <[email protected]>
To
[email protected]
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 <[email protected]> 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
[email protected]
On 13 December 2013 10:20, Nicola Tommasi <[email protected]> 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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*
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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/