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st: SV: RE: Splitting a textvariable


From   "Tomas Lind" <tomas.lind@ki.se>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: SV: RE: Splitting a textvariable
Date   Wed, 12 May 2010 17:24:01 +0200

Thanks Nick and Bjarte for kind help and advice. 

I´ll going to learn more about regular expressions and -strpos()- and
hopefully get it to work.

/Tomas



-----Ursprungligt meddelande-----
Från: owner-statalist@hsphsun2.harvard.edu
[mailto:owner-statalist@hsphsun2.harvard.edu] För Nick Cox
Skickat: den 12 maj 2010 14:14
Till: statalist@hsphsun2.harvard.edu
Ämne: st: RE: Splitting a textvariable

-inrange()- won't work as you want because the address is a string variable.
I can think of two strategies here:

1. Use -split- to split into string and numeric components; then put them
together again with a comma inserted. 

2. Use regular expression functions. 

3. Find the spaces with -strpos()- and stop when you reach the first space
preceded by a number. 

There is some programming needed in each case. 

Nick 
n.j.cox@durham.ac.uk 

Tomas Lind

I have (in principle) a dataset that looks like this with an id-variable and
a text-variable with addresses. Unfortunately there are often several
addresses in the same variable. I have to split these into one variable for
the first address, another for the second and so on.

id   	address
---------------------------------------------------------------
1	Stockholm xroad 12 London yroad10
2	London zroad 31
3	Helsinki rroad 1 Oslo sroad 123 Berlin troad 13


Each address ends with a number. My idea is to put in a parsing "," in the
empty space after the number (to be able to use -split parse-. Like this.


id   	address
----------------------------------------------------------------
1	Stockholm xroad,12 London yroad10
2	London zroad 31,
3	Helsinki rroad 1,Oslo sroad123,Berlin troad 13



One idea to do this is to use something like (if we rename the
address-variable to a shorter name, x).

replace x[i]=","  if x[`i' - 1]==inrange(0, x[`i'], 9) & x[`i']==" "

I´m not sure about how to work out the details to get this into work. Any
help is welcome to put the commas into place. Other ideas are also welcome.


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