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). But it didn't work. Then I found a clumsy way to do it : subset(subset(data,p4==1),p6==1) Which works. But it soon gets very clumsy as the number of conditions increase (I end up with a really large number of nested subsets). Is there a simpler way to do that? -- ______________________________________________ [EMAIL PROTECTED] mailing list https://www.stat.math.ethz.ch/mailman/listinfo/r-help