Checks if the given vector contains only numbers and, optionally, is of the right dimension (length).
is([1, 2, 3]) -> true is([1, "Hello", 3]) -> false is([1, 2, 3], 1) -> false
Optional
Checks if the given vector contains only numbers and, optionally, is of the right dimension (length).
is([1, 2, 3]) -> true is([1, "Hello", 3]) -> false is([1, 2, 3], 1) -> false