R devel - Dec 1997 - R-alpha: is.vector of one-dimensional array

maybe we've already diskussed this before, but Kurt and I can't
remember ...

is.vector() of an one-dimensional array returns FALSE. this is also the
behavior of Splus, but totally counter-intuitive for me ... IMO an
array of dimension 1 is exactly the definition of a vector ...

it also breaks our current plot.factor, which is simply a

	barplot(table(x))

table() returns an one-dimensional array, but barplot only accepts
vector and matrix arguments ...

of course one could check additionally for arrays with correct
dimension ... but ...

any opinions?

fritz

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>is.vector() of an one-dimensional array returns FALSE. this is also the
>behavior of Splus, but totally counter-intuitive for me ... IMO an
>array of dimension 1 is exactly the definition of a vector ...
I assume by "one-dimensional array" you mean a two or higher
dimensional array
with all but one of the values from dim(x)  being 1. This is possibly
counter-intuitive, but there are cases where one needs to distinguish these.
Perhaps length(dim(x)) would be better, but dim returns NULL  for a vector. This
is even more counter-intuitive to me. I think it should return length(x) for a
vector. In any case there is lots of code out there that will break if you
change these.

Paul Gilbert

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