[R] Check for presence of object in group of objects

Christoph Heibl christoph.heibl at gmx.net
Wed Jan 31 11:00:42 CET 2007

Dear List,

must be simple, but i got stuck on this...

I´ve been trying around for some time, but I could not find a  
straigthforward way to do this:
How can one ask if a certain object is element of a certain group of  
objects, e.g stored in a vector?

x <- c("a", "b", "c")
# is there a simple function which returns:
is "a" part of x?
is "d" part of x?

Thanks a lot

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