[R] sub data frame by expression

[Arne.Muller@aventis.com]

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: r-help-bounces at stat.math.ethz.ch
> [mailto:r-help-bounces at stat.math.ethz.ch]On Behalf Of
> Arne.Muller at aventis.com
> Sent: 17 October 2003 12:12
> To: r-help at stat.math.ethz.ch
> 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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