[R] Tell the difference between characters

From: Lisa <lisajca_at_gmail.com>
Date: Tue, 26 Apr 2011 11:09:33 -0700 (PDT)


Dear all,

I just want to determine if the characters in a character string are the same or not. For example,

temp <- c("aa", "aA", "ab")

How do I determine the first one have the two same “a”, and the second and third have the different characters? Thanks in advance.

Lisa  

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