[R] how to have 'match' ignore no-matches

[David Winsemius]

On Oct 5, 2009, at 4:01 PM, Jill Hollenbach wrote:

>
> Hi all,
> I think this is a very basic question, but I'm new to this so please  
> bear
> with me.
>
> I'm using match to translate elements of a data frame using a lookup  
> table.
> If the content of a particular cell is not found in the lookup  
> table, the
> function returns NA. I'm wondering how I can just ignore those  
> cells, and
> return the original contents if no match is found in the lookup table.

Can you construct a simple example (with sufficient complexity and  
lack of matches)  that can be cut-and-pasted into the console along  
with specification of how you want your results?

I cannot understand what you are asking for a "translat[ion] of a  
dataframe" and when you request the "return [of] the original contents  
if no match is found in the lookup table."

-- 
David Winsemius, MD
Heritage Laboratories
West Hartford, CT