On Fri, Dec 4, 2009 at 11:54 AM, Duncan Murdoch <murdoch at stats.uwo.ca> wrote: > On 04/12/2009 12:52 PM, Peng Yu wrote: >> >> The external grep program has an option -v to select non-matching >> lines. I'm wondering if how to exclude certain patterns in grep() in >> R? >> > > ?grep I don't see which argument to use.