Return the matrix size of the argument.
|arg||The object, the size of which is to be measured.|
|return value||The size of the argument.|
The argument can be any scalar, vector, or matrix. It always handles the input as a matrix: a scalar is a 1x1 matrix, a vector is a 1xN size matrix.
The size is a vector in [no. of rows, no. of colums] format.