[Rd] Testing for vectors

Hadley Wickham h@wickh@m @ending from gm@il@com
Sat Jul 7 22:32:28 CEST 2018

On Sat, Jul 7, 2018 at 1:50 PM, Gabe Becker <becker.gabe using gene.com> wrote:
> Hadley,
>> I was thinking primarily of completing the set of is.matrix() and
>> is.array(), or generally, how do you say: is `x` a 1d dimensional
>> thing?
> Can you clarify what you mean by dimensionality sense and specifically 1d
> here?

What do we call a vector that is not an array? (or matrix)

What do we call an object that acts 1-dimensional? (i.e. has
length(dim()) %in% c(0, 1)) ?

> You can also have an n x 1 matrix, which technically has 2 dimensions but
> conceptually is equivalent to a 1d array and/or a vector.

Yes. You can also have array that's n x 1 x 1.

> Also, are you including lists in your conceptions of 1d vector here? I'm
> with Duncan here, in that i'm having trouble understanding exactly what you
> want to do without a bit more context.

Isn't it standard terminology that a vector is the set of atomic vectors + list?



More information about the R-devel mailing list