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
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