Can't find Matrix*Vector operations

In Rhino.Geometry.Matrix and Rhino.Geometry.Vector3d I can’t find the operations for matrix*vector.

It is not that hard to implement

def m_matrix_vector3d(M, v):
    assert M.ColumnCount == 3
    res = M.RowCount*[0]
    v_tmp = [v.X, v.Y, v.Z]
    for i in range(M.RowCount):
        for j in range(M.ColumnCount):
            res[i] += M[i, j]*v_tmp[j]
    return res

But are there not a build in function that I am missing?

Are you sure you don’t need Rhino.Geometry.Transform?