On Wed, 24 Dec 2014, Jeff Newmiller wrote:
On December 24, 2014 6:49:47 PM PST, Mike Miller <mbmille...@gmail.com> wrote:
On Wed, 24 Dec 2014, Mike Miller wrote:
Also, regarding the sacred text, "x A numeric." is a bit terse. The
same text later refers to length(x), so I suspect that "A numeric" is
short for "A numeric vector", but that might not mean "a vector of
'numeric' type."
I just realized that numeric type includes integer so that anything of
type integer also is type numeric. I'm working on another message.
But all numeric types in R are vectors. So although it might be a good
idea to be redundant to aid beginners, the phrase "a numeric" is
accurate.
Interesting, but the data seem to contradict your theory. Here are two
examples, one with a numeric matrix, the other with a numeric array, and
both of them run in ave().
x <- matrix(1:4, 2,2)
is.numeric(x)
[1] TRUE
is.vector(x)
[1] FALSE
ave(x, gl(2,2))
[,1] [,2]
[1,] 1.5 3.5
[2,] 1.5 3.5
x <- as.array(1:4)
is.numeric(x)
[1] TRUE
is.vector(x)
[1] FALSE
ave(x, gl(2,2))
[1] 1.5 1.5 3.5 3.5
So maybe slightly more documentation for ave() would be helpful even for
non-beginners like yourself.
Thanks.
Mike
--
Michael B. Miller, Ph.D.
University of Minnesota
http://scholar.google.com/citations?user=EV_phq4AAAAJ
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