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Re: st: loop until "0 real changes made"


From   Nick Cox <njcoxstata@gmail.com>
To   "statalist@hsphsun2.harvard.edu" <statalist@hsphsun2.harvard.edu>
Subject   Re: st: loop until "0 real changes made"
Date   Mon, 29 Jul 2013 15:05:34 +0100

One answer is not to use regular expressions here at all. Use
-subinstr()- with statements like

replace `v' = subinstr(`v', "`=char(195)'`=char(135)'","C", .)

Another answer is to set up a count of changes and stop when you hit zero.

clonevar AD2 = AD

foreach v of var AD {
           replace AD2 = AD
           <work with AD>
           count if AD2 != AD
           if r(N) == 0 continue, break
}

Nick
njcoxstata@gmail.com

On 29 July 2013 14:48, Haluk Vahaboglu <vahabo@hotmail.com> wrote:

> I am using Stata 12.1 for Linux-64 bit and dealing with Turkish characters in string variables. I convert these Turkish characters (ı, ş, ü etc) to readable equivalents (i, s, u etc). Doing this with the code below:
>
> foreach v of var AD {
>            replace `v'=regexr(`v', "`=char(195)'+`=char(135)'","C")
>            replace `v'=regexr(`v', "`=char(196)'+`=char(176)'","I")
>            replace `v'=regexr(`v', "`=char(195)'+`=char(167)'","c")
>            replace `v'=regexr(`v', "`=char(195)'+`=char(182)'","o")
>            replace `v'=regexr(`v', "`=char(196)'+`=char(177)'","i")
>            replace `v'=regexr(`v', "`=char(196)'+`=char(158)'","G")
>            replace `v'=regexr(`v', "`=char(196)'+`=char(159)'","g")
>            replace `v'=regexr(`v', "`=char(195)'+`=char(156)'","U")
>           replace `v'=regexr(`v', "`=char(195)'+`=char(188)'","u")
>           replace `v'=regexr(`v', "`=char(197)'+`=char(158)'","S")
>           replace `v'=regexr(`v', "`=char(195)'+`=char(150)'","O")
>           replace `v'=regexr(`v', "`=char(197)'+`=char(159)'","s")
> }
>
> However, this code cannot accomplish the conversion at the first time. Therefore, I have to do it 5 to 10 times to get a (0 real changes made) message.
> My question is: can I make this loop run automatically until I get the (0 real changes made) message which indicates that all characters are converted.

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