From: Sangita Kachhap (
Date: Tue Mar 21 2023 - 13:05:05 CDT


I have MD trajectories of a protein system having 4 chains, and I have to
calculate the rotation angle and axis of each chain.
Through VMD, I have calculated a transformation (4X4) matrix, having 3X3
rotation matrix and 1 translation matrix. But, I have no idea how to get
rotation angle and axis from transformation matrix

It would be great if anyone could help me.