Re: [R] select rows from data based on a vector of char strings

From: seanpor <seanpor_at_acm.org>
Date: Thu, 24 Apr 2008 02:20:04 -0700 (PDT)

or using the %in% operator...

?"%in%"

data[data$label %in% flist,]

regards,
Sean

Applejus wrote:

> 
> Hi,
> 
> You are right the == doesn't work, but there's a workaround using regular
> expressions:
> 
> flist<-"fun|food"
> grep(flist, data$label)
> 
> will give you the vector [2 4] which are the numbers of the rows of
> interest!
> 
> 
> Dirkheld wrote:

>>
>> Hi,
>>
>> I have loaded a dataset in R :
>> data =
>>
>> label freq1 freq2
>> news 54 35
>> fun 37 21
>> milk 19 7
>> food 3 3
>> .... etc
>>
>> And I have a vector
>> flist<-c("fun","food")
>>
>> Now I want to use the vector 'flist' for selecting these values from
>> 'data' so that I get the following dataset :
>> label freq1 freq2
>> fun 37 21
>> food 3 3
>>
>> When I do 'data$label==flist[1]' I get 'F T F F', so it works for one
>> item in the char vector flist.
>> But, when I do 'data$label==flist' I get 'F F F F' while I expected 'F T
>> F T'. It seems that I can't perform this action with a vector of
>> charstrings?
>>
>> Is there an other way to do so?
>>
>>
>
>
-- 
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