cannot multiply matrix by vector

[sneakyimp]

In matlab/octave, I can define a m x n matrix (3 x 5 in this case) and multiply it by a n x 1 column vector (5 x 1 in this case). It yields a 3x1 column vector:

X = [1 1 1 1 1; 2 2 2 2 2; 3 3 3 3 3]
    X =

       1   1   1   1   1
       2   2   2   2   2
       3   3   3   3   3

octave:427> w = [1;2;3;4;5]
    w =

       1
       2
       3
       4
       5

octave:428> X * w
    ans =

       15
       30
       45

However, ghostjat cannot multiply a 3 x 5 matrix times a vector with size=5:

require __DIR__ . '/np/vendor/autoload.php';
use Np\matrix;
use Np\vector;

$x = Np\matrix::ar([
        [1,1,1,1,1],
        [2,2,2,2,2],
        [3,3,3,3,3]
]);

$w = Np\vector::ar([1, 2, 3, 4, 5]);

$p = $x->dot($w); // throws exception Mismatch Dimensions of given Objects! Obj-A col & Obj-B row amount need to be the same!
$p = $x->multiply($w); // throws exception Mismatch Dimensions of given Objects! Obj-A col & Obj-B row amount need to be the same!