[R] need hints on basic character string functions

[Liaw, Andy]

See ?tolower and ?nchar.

Andy

> From: Terry Mu
> 
> Hello,
> 
> for now, I need to transform "A" to "a", and need to know 
> length of "ABC", etc.
> 
> Please show me a starting point for character string functions.
> 
> Thank you.
> 
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