[R] starting with a capital letter
Charles C. Berry
cberry at tajo.ucsd.edu
Sat Sep 15 19:45:35 CEST 2007
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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> and provide commented, minimal, self-contained, reproducible code.
>
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
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