[R] Remove duplicates from a data frame but with some special requirements

gcam gcam032 at gmail.com
Thu Dec 17 04:55:52 CET 2009

Hi all.

So I have a data frame with multiple columns/variables.  The first variable
is a major sample name for which there are some sub-samples.  Currently I
have used the following command to remove the duplicates:


This removes all of the duplicated sample rows.

However, I just realised that, of course, this removes the first observation
of each duplicated set.  However, I wish to retain any that have the code
"Y" in another variable Samps$Loaded.  I'm at a bit of a loss as to how best
to approach this problem.

Just to reiterate.  I want to remove all duplicate lines based on sample
name, but, I want the lines to be removed with a preference given to those
that do not include a "Y" in the Loaded variable column.
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