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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