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 factors then you can perform < and > comparisons, but that can
affect the statistical algorithms you apply elsewhere.
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Sent from my phone. Please excuse my brevity.
B Jessop <deel...@hotmail.com> 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 Fish Datavalue
AB 2-1 2.3
AB 2-1 2.4
AB 2-1 2.2
AB 2-2 2.6
AB 2-2 2.5
AB 2-2 2.7
AB 2-3 1.6
AB 2-3 1.5
AB 2-3 1.4
etc
AB 2-20 3.1
AB 2-20 2.9
AB 2-20 3.0
I would like to create a subset containing all variable rows but for only, say,
Fish 2-1, 2-2, and 2-3. The following code:
Df2 <- subset(Df1, Eel=="2-1" | Eel=="2-3") selects only Eel 2-1 and 2-3. The
use of a ":" rather than "|" gives an error message. My other approaches did
not work. Any
suggestions for doing this task would be much appreciated.
Regards,
BJ
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