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Re: st: regexr string function very slow in Stata13
From
William Buchanan <[email protected]>
To
"[email protected]" <[email protected]>
Subject
Re: st: regexr string function very slow in Stata13
Date
Fri, 13 Dec 2013 05:15:20 -0600
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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