select rows from data based on a vector of char strings

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?