[R] Why doesn't as.vector() return a vector?
Prof Brian Ripley
ripley at stats.ox.ac.uk
Fri Jan 5 18:59:08 CET 2001
On Fri, 5 Jan 2001, Peter Kleiweg wrote:
>
> I use as.vector() on a data frame and I get a data frame in
> return. No warning. I have to use as.matrix() first. Why is
> that? Doesn't make sense to me. I'm using R 1.2.0 on Linux.
A data frame is a list. A list is a vector, ....
The documentation for as.vector has already been corrected.
Try
> as.vector(F, mode="numeric")
Error in as.vector(F, mode = "numeric") : (list) object cannot be coerced
to vector type 14
which is probably what you might have expected, and correctly gives an
error.
>
> > F <- data.frame(a = c(1,2,3), b = c(4,5,6))
> > F
> a b
> 1 1 4
> 2 2 5
> 3 3 6
> > V <- as.vector(F)
> > V
> a b
> 1 1 4
> 2 2 5
> 3 3 6
> > attributes(V)
> $names
> [1] "a" "b"
>
> $row.names
> [1] "1" "2" "3"
>
> $class
> [1] "data.frame"
>
> > as.vector(as.matrix(F))
> [1] 1 2 3 4 5 6
>
> --
> Peter Kleiweg
> http://www.let.rug.nl/~kleiweg/
>
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--
Brian D. Ripley, ripley at stats.ox.ac.uk
Professor of Applied Statistics, http://www.stats.ox.ac.uk/~ripley/
University of Oxford, Tel: +44 1865 272861 (self)
1 South Parks Road, +44 1865 272860 (secr)
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