Rainer provided an example of subsetting by the value of a variable in the
data frame. Below is an example of subsetting by the value of the row
name of the data frame.
df <- data.frame(var1=1:10, var2=letters[1:10], var3=sample(10),
row.names=month.abb[1:10])
subset(df, subset = row.names(df) %in% c("Feb", "Jul", "Sep"),
select=c(var1, var2))
var1 var2
Feb 2 b
Jul 7 g
Sep 9 i
Jean
Rainer Schuermann wrote on 09/09/2011 07:44:11 AM:
>
> Does that help:
>
> > x
> xin xout
> 1 1 14
> 2 8 5
> 3 16 884
> 4 1 14
> 5 8 5
> 6 16 884
>
> > subset( x, x$xin > 7, select = xout )
> xout
> 2 5
> 3 884
> 5 5
> 6 884
>
> Rgds,
> Rainer
>
>
> On Friday 09 September 2011 04:38:44 stat.kk wrote:
> > Hi,
> >
> > can anyone help me how to use 'subset' function on my data frame?
> > I have created data frame 'data' with a few variables and with row
names.
> > Now I would like to subset rows with concrete row names.
> > Using data[] I know how to do it. But I dont know how to formulate the
> > subset condition:
> > subset(data, subset = ?, select = c(var1, var2))
> >
> > Thank you very much,
> > stat.kk
> >
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