On 7/13/2009 10:21 AM, Mark Knecht wrote:
Thanks Jim.
How does one search the help system for info on simple logic like this?
Look in the manuals (the pdf ones), rather than the man pages. For
example, expressions like the ones below are in the Introduction to R,
section 2.4, Logical Vectors. (The table of contents contains "Logical
vectors", within "Simple manipulations".)
Duncan Murdoch
On Mon, Jul 13, 2009 at 6:59 AM, jim holtman<jholt...@gmail.com> wrote:
1) X <- subset(A, (t < 1000) | (t > 1200))
2) X <- subset(A, (t > 1000) & (t < 1200))
On Mon, Jul 13, 2009 at 9:47 AM, Mark Knecht<markkne...@gmail.com> wrote:
How would I write the two selections each in a single subset command?
1) Two non-overlapping time ranges I want to collect together - before
10AM and after noon. Should be an OR function:
X = subset(A, t<1000) + subset(A, t>1200)
2) One range between two defined times like after 10AM and before
noon. Should be an AND function:
X1 = subset(A, t>1000)
X = subset(X1, t<1200)
Thanks,
Mark
P.S. - The help system seems very difficult for finding this sort of
information!
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--
Jim Holtman
Cincinnati, OH
+1 513 646 9390
What is the problem that you are trying to solve?
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______________________________________________
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PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
