[Chimera-users] Measure inertia?

Elaine Meng meng at cgl.ucsf.edu
Thu Jan 24 15:53:37 PST 2013

Hi Yen,
It is simply a calculation of principal axes where atoms are mass-weighted points, see:

I doubt someone would publish a paper about such a fundamental calculation, so although I did not read the J Mol Graph paper, it is likely to be a different method.

The person who wrote the "measure inertia" code is away currently, but if there is anything else to say, he may send another reply later.
Elaine C. Meng, Ph.D. 
UCSF Computer Graphics Lab (Chimera team) and Babbitt Lab
Department of Pharmaceutical Chemistry
University of California, San Francisco

On Jan 24, 2013, at 1:07 PM, Yen-Ting Lai wrote:

> Hi,
> What's the formula that's used by "measure inertia"?
> I found a paper: 
> An ellipsoidal approximation of protein shape. J. Mol Graph (1983)
> Does the "measure inertia" use the same method?
> Thank you!
> Yen

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