changing the element of a quaternion

[calocedrus]

Say I have:
myq = np.quaternion(ww,xx,yy,zz)
I can do

myq_x=myq.x # a float
myq_y=myq.y # a float

but not
myq.x = myq.y # AttributeError: readonly attribute
I would find it useful to be able to have the quaternion attributes as write also, for example to easily change the axis of rotation. What is the reason to set them as readonly? And then how to, for example, swap 2 elements of a quaternion (such as swap xx with yy as above)?

[moble]

That's a great question! The "reason" they were set as READONLY is because I'm no expert on python's C API, so I just didn't know any better. I've changed that now, though, so if you update you should be able to set those components. Thanks!

The usual python way to swap a and b is to do a, b = b, a. So in this case, you can do

import numpy as np
import quaternion
q = np.quaternion(0, 1, 2, 3)
q.w, q.x = q.x, q.w