[R] starting with a capital letter

[Charles C. Berry]

On Sat, 15 Sep 2007, kevinchang wrote:

>
> Hi everyone,
>
> I am wondering if there is any built-in funcion that can determine whether
> words in a character vector start with a captial letter or not. Help,
> please. Thanks.

Yes. But your query is not precise. See the posting guide and provide 
commented, minimal, self-contained, reproducible code (as is requested) to 
be sure the answers you get address the question you really want answered.

I see several possiblilities.

In this vector:

 	my.charvec<- c( "Abc", "abc Abc", "abc aBc" )

You wish to match element 1 only or 1 and 2 only and perhaps report where 
in each element the last match was found.


 	res <- regexpr( "\\<[[:upper:]].*" , my.charvec )

should get you started. Examples:

 	which( res == 1 ) # first case

 	which( res != -1 ) # second case

See

 	?regexpr

Also,

 	?strsplit

which I think would be needed to recover the locations of each of 
several capitalized words in a single element. e.g. "abc Def Ghi"

Chuck

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>

Charles C. Berry                            (858) 534-2098
                                             Dept of Family/Preventive Medicine
E mailto:cberry at tajo.ucsd.edu	            UC San Diego
http://famprevmed.ucsd.edu/faculty/cberry/  La Jolla, San Diego 92093-0901