Fernando Henrique Ferraz Pereira da Rosa <[EMAIL PROTECTED]> writes: > Is it possible in R to subset a dataframe by more than one factor, all at > once? > For instance, I have the dataframe: > >data > p1 p2 p3 p4 p5 p6 p7 p8 p9 p10 pred > 1 0 1 0 0 0 0 0 0 0 0 0.5862069 > 4 0 0 0 0 0 0 0 0 0 1 0.5862069 > 5 0 0 0 0 0 0 1 0 0 0 0.5862069 > 6 0 0 0 0 0 0 0 1 0 0 0.5862069 > 7 0 0 1 0 0 0 0 0 0 0 0.5862069 > 9 0 0 0 0 1 0 0 0 0 0 0.5862069 > 20 0 1 1 0 0 0 0 0 0 0 0.5862069 > 22 0 1 0 0 1 0 0 0 0 0 0.5862069 > 24 0 1 0 0 0 0 1 0 0 0 0.5862069 > 25 0 1 0 0 0 0 0 1 0 0 0.5862069 > 27 0 1 0 0 0 0 0 0 0 1 0.5862069 > > If I want to subset only those points that have p4 = 1, I do: > > subset(data,p4 == 1) > And that's fine. Now suppose I want to subset those that not only have p4 > = 1, but also p6 = 1. > I tried subset(data,p4 == 1 && p6 == 1) or subset(data,p4==1 & p6==1).
As Sundar pointed out it is the second form that you want. When intersecting conditions in subset() use &, not &&. The way that you pasted the output in your message the column names did not align with the columns. I changed this in the part that I quoted above. This shows that you chose the wrong example, I think, because that intersection is empty. Try subset(data, p2 == 1 & p3 == 1) instead. ______________________________________________ [EMAIL PROTECTED] mailing list https://www.stat.math.ethz.ch/mailman/listinfo/r-help
