[R] select levels of factor variables

[David Winsemius]

On May 25, 2011, at 4:46 AM, zoe.cryocla wrote:

> Hi again,
> I've got another question...
>
>
> I often use the symbol == to select some levels of factor variables  
> like :
> data[data$var=="blabla", [
>
> But this time, I'd like to select all the levels of my variable wich  
> contain
> the letter "B", is that a way to determine this conditions ?

Perhaps with grep and/or  %in%

Got a reproducible example? ...preferably constructed with dput

-- 

David Winsemius, MD
West Hartford, CT