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@drroe drroe commented Jul 29, 2022

Version 6.12.2.

This PR adds the option to use the quaternion-based RMSD calculation of Theobald & Piu (based on the code originally found in https://theobald.brandeis.edu/qcp/qcprot.c but adapted to C++ and modified for use with CPPTRAJ's internal routines) to the 2drms and cluster commands via a new keyword, qrmsd. The quaternion RMSD returns the same values as Kabsch-based RMSD but tends to be about 15-20% faster. Adds a test, updates the manual, prints a citation when used, and adds a small blurb to the README.

Daniel R. Roe and others added 30 commits April 5, 2018 15:21
…aj; eliminates need for re-ordering coordinates.
…r than "normal" RMSD, so does not seem worth pursuing at this time.
@drroe drroe self-assigned this Jul 29, 2022
@drroe drroe merged commit ccbc93b into Amber-MD:master Jul 29, 2022
@drroe drroe deleted the quat_rmsd.withMaster branch July 29, 2022 16:38
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