--- Vector#* a
    returns a vector multiplied by scalar `a'

    a褸٥ȥ֤

--- Vector#* m
    returns a vector multiplied by matrix `m' from right side.

    ٥ȥ()Ѵ(ºݤˤMatrix#column_vector [Matrix/column_vector](self)Ŭ)顢m򱦤褸(Matrix饹)֤

