[Rd] negative numerics in []
Michael Haupt
michael.haupt at oracle.com
Thu Sep 4 17:17:16 CEST 2014
Hello,
I'm a bit puzzled by what looks (to me) like a discrepancy between documentation and implementation.
The documentation for [] says this about the indices: "Numeric values are coerced to integer as by as.integer (and hence truncated towards zero)."
> as.integer(-3.1)
[1] -3
Good. But:
> x <- c(1,2,3)
> x[-3.1]
[1] 1 2 3
Given the documentation, I'd have expected a result of "[1] 1 2", because -3.1 should be coerced to -3 (by virtue of as.integer).
What bit do I not get? (I'm using R 3.1.1, if that matters.)
Best,
Michael
--
Dr. Michael Haupt
Principal Member of Technical Staff
Phone: +49 331 200 7277, Fax: +49 331 200 7561
Oracle Labs
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