[R] substring comparison

[Claus O'Rourke]

Thanks. It works perfectly.

On Thu, Apr 29, 2010 at 6:24 PM, Henrique Dallazuanna <wwwhsd at gmail.com> wrote:
> Try with grepl:
>
> data$ContainsThe <- ifelse(grepl("the",data$Utt),"y","n")
>
> On Thu, Apr 29, 2010 at 2:17 PM, Claus O'Rourke <claus.orourke at gmail.com>
> wrote:
>>
>> Hi all,
>>
>> I'm writing a script to do some basic text analysis in R. Let's assume
>> I have a data frame named data which contains a column named 'utt'
>> which contains strings. Is there a straightforward way to achieve
>> something like this:
>>
>> data$ContainsThe <- ifelse(startsWith(data$Utt,"the"),"y","n")
>>
>> or
>>
>> data$ContainsThe <- ifelse(contains(data$Utt,"the"),"y","n")
>> ?
>>
>> I tried using grep
>> data$ContainsThe <- ifelse(grep("the",data$Utt),"y","n")
>>
>> but this doesn't work becausee grep only returns the rows for which
>> grep succeeded.
>>
>> Thanks for any pointers
>>
>> Claus
>>
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>
>
>
> --
> Henrique Dallazuanna
> Curitiba-Paraná-Brasil
> 25° 25' 40" S 49° 16' 22" O
>