  The matrix Schroedinger equation with a selfadjoint matrix potential is
considered on the half line with the general selfadjoint boundary condition at
the origin. When the matrix potential is integrable, the high-energy
asymptotics are established for the related Jost matrix, the inverse of the
Jost matrix, and the scattering matrix. Under the additional assumption that
the matrix potential has a first moment, Levinson's theorem is derived,
relating the number of bound states to the change in the argument of the
determinant of the scattering matrix.
