prod

Specification

Location	Author	Maintained by
isl/math/quaternion.py	Kenny Erleben	DIKU

The purpose of this function is to make a Quaternion product

    Two queaterions q = [s,v] and q' = [s',v'] are multiplied with each other as follows

$qq' - v \cdot v', sv' + s'v + v \times v$

    :param: make 
    :return: [] numpy.float64, length 4  

    quaternion   = quat.make(1,2,3,4)
    print(test_vec_1)

output:

   [1,2,3,4]