On Aug 4, 2009, at 11:16 AM, Rnewbie wrote:
dear all,
I got a problem with pattern matching using grep. I extracted a list
of
characters from a data frame, and I tried to match this list of
characters
to a column from another data frame. In return, I got only one
match, but
there should be far more matches. Any ideas what has gone wrong?
In general this falls into the category of a request to "read my
mind". One, out of probably an infinite number, of ways to get such a
result is to use if() when you needed ifelse().
Another question, if I also want to match the whole of the elements
against
the non-initial parts of the elements in another table. Which
command should
I use?
Cannot even assign a semantic meaning to that one. What is are "non-
initial parts of the elements of another table"?
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Thanks
David Winsemius, MD
Heritage Laboratories
West Hartford, CT
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