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Re: st: RE: problems on the string functions


From   gjhxmu@sina.com
To   statalist<statalist@hsphsun2.harvard.edu>
Subject   Re: st: RE: problems on the string functions
Date   Fri, 20 Nov 2009 00:47:47 +0800

Thank you very much, Baum and Nick.
I understood the use of -subinstr-, -word- and -strpos- with your help.
Another problem is how to deal with it if the strings excluded from another string variable is not consecutive.

for example,
clear
input str10 (v1 v2)
ab123d  12d
efg34  f4
end

I want to get v3 as followings
v3 
ab3
eg3


Thank you for any help.

Best regards,
Rose

----- Original Message -----
From: Nick Cox <n.j.cox@durham.ac.uk>
To: <statalist@hsphsun2.harvard.edu>
Subject: st: RE: problems on the string functions
Date: 2009-11-19 23:59:43

Answers embedded below. 

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

gjhxmu@sina.com

1. I want to replace the second word in a string varible with another
word. What is the right function?

NJC>>> If you're lucky, -subinstr()- might be enough. 
Otherwise, use -split- followed by -egen, concat()- 

I have looked up string functions. Unluckily, no findings.
BTW, I found -word()- was maybe useful for what I want to do. However,
missing values were always caused when I applied.
For example,

clear
input str6 v1
123
abc
2da
end
l
g v2=word(v1,2)

The result window showed "(3 missing values generated)" .

Could anyone tell me why?

NJC>>> Sure. None of these strings has more than one word. So, the
second word is empty (missing). 

2.I have two string variables v1 and v2. I want to generate a new
variable v3 as following.

v1 v2 v3
abc123 123 abc
ab45 b45 a
cdef67 f67 cde

How to deal with it?

NJC>>> 

gen v3 = substr(v1, 1, strpos(v1, v2) - 1) 




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