Sorry, I just figured it out: x[x$Batch == 'OLD',] instead of x[x$Batch ==
'OLD']. I didn't know this has to be in the same format then x[1:20,] where I
already used the comma.
sorry for posting the previous message ...
Arne
> -----Original Message-----
> From: [EMAIL PROTECTED]
> [mailto:[EMAIL PROTECTED] Behalf Of
> [EMAIL PROTECTED]
> Sent: 17 October 2003 12:12
> To: [EMAIL PROTECTED]
> Subject: [R] sub data frame by expression
>
>
> 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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