void checkInertiaAccProduct(const ArticulatedBodyInertia & inertia, const SpatialMotionVector & twist) { SpatialForceVector momentum = inertia*twist; Vector6 momentumCheck; Matrix6x6 I = inertia.asMatrix(); Vector6 twistPlain = twist.asVector(); toEigen(momentumCheck) = toEigen(I)*toEigen(twistPlain); ASSERT_EQUAL_VECTOR(momentum.asVector(),momentumCheck); }