uutzinger's profile - activity

2024-02-05 13:56:52 +0200	received badge	● Popular Question (source)
2015-07-31 03:33:17 +0200	asked a question	How do I multiply quaternion and vector? I started with this `N.<c,d,a1,a2,a3,a4,b1,b2,b3,b4,s> = QQ[] H.<i,j,k> = QuaternionAlgebra(c,d) a = a1 + a2 * i + a3 * j + a4 * k b = b1 + b2 * i + b3 * j + b4 * k a+b ab` but the next step does not work `gravity = vector([0, 0, 1]) a gravity * a.conjugate()`
2015-07-31 03:24:53 +0200	received badge	● Editor (source)
2015-07-31 03:24:24 +0200	answered a question	How to do symbolic computation with quaternions `N.<c,d,a1,a2,a3,a4,b1,b2,b3,b4,s> = QQ[] H.<i,j,k> = QuaternionAlgebra(c,d) a = a1 + a2 * i + a3 * j + a4 * k b = b1 + b2 * i + b3 * j + b4 * k a+b a*b` From http://www.wstein.org/edu/2010/414/pr... Seems to give better results Now I just need to figure out how to define vector and rotate it with quaternion.