Your expectations of the | operator don't seem fair... you should reread ?"|"
and perhaps the "Introduction to R" document.
In particular, there is no "between" operator in R. The %in% operator allows
you an efficient way to identify any of many specific cases. If you are working
with ordered f
On Aug 18, 2011, at 10:27 AM, B Jessop wrote:
Dear r-help,
I would like to select a subset of levels from a factor variable in
a data frame and return a data frame.
The data set consists of 3 variables, 2 of which are factors (Site,
Fish) and one numeric (Datavalue) as follows:
Site
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