Performant Python

Solutions

As you would expect there is a built in numpy function cross but its usage is slightly different that for the dot product.

p = np.array([2,3,4])
q = np.array([5,6,7])
np.cross(p,q)

array([-3,  6, -3])

If you want to understand why the cross product has a different form from the dot product you need can ask a mathematician ...