data frame subsets?
On Nov 12, 2009, at 10:57 PM, Douglas M. Hultstrand wrote:
Hello, I am trying to create data frame subsets based on binned temperature data. I have code working to create the bins (d.1 and d.2), but it takes two steps, I was wondering if I could merge into one step. See Below d n year mo da hr t td tw rh kPa 1 1 1945 3 1 0 1.1 0.0 0.6 92 101.7 2 2 1945 3 1 1 2.8 -1.1 1.1 76 101.8 3 3 1945 3 1 2 2.2 -1.7 0.6 75 101.9 4 4 1945 3 1 3 1.7 -1.1 0.6 82 102.0 5 5 1945 3 1 4 1.7 -2.8 0.0 72 102.1 6 6 1945 3 1 5 1.7 -1.7 0.0 78 102.2 7 7 1945 3 1 6 1.1 -2.8 0.0 75 102.2 8 8 1945 3 1 7 1.1 -1.7 0.0 82 102.4 9 9 1945 3 1 8 1.7 -1.1 0.6 82 102.5 10 10 1945 3 1 9 2.8 -3.3 0.6 64 102.6 d.1 <- d[d$t >= 1.0,] d.2 <- d.1[d.1$t < 2.0,] How can I make d.1 and d.2 into one step? I have tried several different methods such as example below. d.1 <- d[d$t >= 1.0, && d$t < 2.0,]
Instead of using "&&" , use "&". It is the vectorized version of the AND operation. "&&" only operated on the first two elements and returned a scalar rather than the vector you needed.
David Winsemius, MD Heritage Laboratories West Hartford, CT