[phenixbb] Axis of Rotation

[Tim Gruene]

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Dear Ashok,

you can get the axis as described in
https://en.wikipedia.org/wiki/Rotation_matrix#Conversion_from_and_to_axis-angle,
i.e. you find the eigenvectors and -values of the matrix (R-I). This
can be done with algebra programs like octave or maxima.

The angle alpha is given by (also see above link) by tr(R) = 1+2cos(alpha)

It's probably 5-10min typing including search the web for the
respective syntax.

Best,
Tim

On 07/10/2015 07:22 AM, Ashok Nayak wrote:
> Dear Phenixites,
> 
> I have a helical bundle structure, where in I wish to understand by
> what rotation and about which axis the dimers are inter-related.
> What I get from the superposition with Superpose is the
> transformation matrix and not the axis, and the angles are also
> elusive. Thanks in advance
> 
> 
> 
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> 

- -- 
- --
Dr Tim Gruene
Institut fuer anorganische Chemie
Tammannstr. 4
D-37077 Goettingen
phone: +49 (0)551 39 22149

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