R help - Apr 2005 - how to separate a string

hello, 
i wonder how is string represent in R. if i have a string s= "hello",
how can i refer to first character in the string s?
also if i have s1 = "hello.1", s2 = "ok.1",  how can i
separate the s1 into "hello" "1" and s2 into "ok"
and "1"? I have tried to use the substring function, but i don't
where i can get the index for "." in the string?
 
Thank you so much
 
C-Ming
April 12, 2005

		
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To get the first character from a string, use substr(s, 1, 1)

To split strings at a period, use strsplit(s, "\\.") (the period must
be quoted, as "." matches anything in a regular expression).

To get the index for "." in a string, see "?regexpr, but you will
not
need to do that if you use strsplit().

Cheers,
Rich

On 4/13/05, Cuichang Zhao <cuiczhao at yahoo.com>
wrote:
> hello, 
> i wonder how is string represent in R. if i have a string s=
"hello", how
> can i refer to first character in the string s? 
> also if i have s1 = "hello.1", s2 = "ok.1",  how can i
separate the s1 into
> "hello" "1" and s2 into "ok" and
"1"? I have tried to use the substring
> function, but i don't where i can get the index for "." in
the string?
>  
> Thank you so much
>  
> C-Ming
> April 12, 2005
> 
> 		
> ---------------------------------
> 
> 
> 	[[alternative HTML version deleted]]
> 
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-- 
Rich FitzJohn
rich.fitzjohn <at> gmail.com   |   
http://homepages.paradise.net.nz/richa183
                      You are in a maze of twisty little functions, all alike