Perhaps
intersect()
or
merge()
will help. But, like others, I find it difficult to understand
exactly what you want. I'd suggest providing a short example with
actual ID values.
-Don
At 2:36 AM -0700 8/5/09, Rnewbie wrote:
I wanted to extract my interested rows from a dataframe. I used:
grep(list$ID, dataframe$ID, value=T) #list contains a list of my interested
IDs
I got one match in return, which is the very first ID in list. It seems the
matching process just stopped, once the first match was found.
David Winsemius wrote:
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"?
******************************************************************
.... provide commented, minimal, self-contained, reproducible code.
******************************************************************
Thanks
David Winsemius, MD
Heritage Laboratories
West Hartford, CT
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--
--------------------------------------
Don MacQueen
Environmental Protection Department
Lawrence Livermore National Laboratory
Livermore, CA, USA
925-423-1062
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