Hi All,
I've the following data frame with 54 rows and 4 colums:
> x
Ratio Dose Time Batch
R.010mM.04h.NEW 0.02 010mM 04h NEW
R.010mM.04h.NEW.1 0.07 010mM 04h NEW
...
R.010mM.24h.NEW.2 0.06 010mM 24h NEW
R.010mM.04h.OLD 0.19 010mM 04h OLD
...
R.010mM.04h.OLD.1 0.49 010mM 04h OLD
R.100mM.24h.OLD 0.40 100mM 24h OLD
I'd like to create a sub data frame containing all rows where Batch == "OLD"
and keeping the 4 colums. Assume that I don't know the order of the rows
(otherwise I could just do something like x[1:20,]).
I've tried x[x$Batch == 'OLD'] or x[x[,4] == 'OLD'] but it generates errors.
So I assume I've still not realy understood the philosophy of indexing ...
:-(
What's the easiest way to do this, any suggestions?
thanks a lot for you help,
Arne
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