# der_Cquat_by_v¶

Being C=C(quat) the rotational matrix depending on the quaternion q and defined as C=quat2rotation(q), the function returns the derivative, w.r.t. the quanternion components, of the vector dot(C,v), where v is a constant vector.

The elements of the resulting derivative matrix D are ordered such that:

$d(C*v) = D*d(q)$

where $$d(.)$$ is a delta operator.