[R] starting with a capital letter

[Charles C. Berry]

Two corrections to my previous posting.

On Sat, 15 Sep 2007, Charles C. Berry wrote:

> 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.

Better make that 'first' match

>
>
> 	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"
>

Not!

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

will do just fine.

> Chuck
>
>> --
>> View this message in context: http://www.nabble.com/starting-with-a-capital-letter-tf4447302.html#a12689105
>> Sent from the R help mailing list archive at Nabble.com.
>>
>> ______________________________________________
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>> PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
>> 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
>
> ______________________________________________
> R-help at r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
> 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