[kgwgk]

From that link:

> A vector is what is called an array in all other programming languages except R

Vectors are called vectors in several "wispy" languages: Common Lisp, Scheme, Clojure...

> An array with two dimensions is (almost) the same as a matrix.

I think it's the same, not "almost" the same. At least in the current version of R:

  > class(array(1, c(2,3)))
  [1] "matrix"
  > identical(array(1, c(2,3)), matrix(1, nrow=2, ncol=3))
  [1] TRUE

In 4.0 there will be a change and the class of a matrix will be both "matrix" and "array", but I think the fact that there is no difference between a 2-dimensional array and a matrix remains.