VMD-L Mailing List

From: Axel Kohlmeyer (akohlmey_at_cmm.chem.upenn.edu)
Date: Tue Oct 28 2008 - 12:14:13 CDT

On Tue, 28 Oct 2008, Edward Lyman wrote:

EL> Hi all,

hi edward,

EL>
EL> I am looking for an explicit definition of the 4x4 matrix that is is used to
EL> 'move' a selection. e.g., lets say I just want to rotate a selection by 30
EL> degrees around the y axis. z_new = sin(30)x_old + cos(30) z_old...but which
EL> matrix elements are which? and what's up with the extra row and column?

please have a closer look at the matrix commands that will
build those matrices for you:

http://www.ks.uiuc.edu/Research/vmd/current/ug/node178.html

cheers,
   axel.

EL> somehow they must correspond to translations...
EL>
EL> thx,
EL> Ed
EL> 

-- 
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Axel Kohlmeyer   akohlmey_at_cmm.chem.upenn.edu   http://www.cmm.upenn.edu
   Center for Molecular Modeling   --   University of Pennsylvania
Department of Chemistry, 231 S.34th Street, Philadelphia, PA 19104-6323
tel: 1-215-898-1582,  fax: 1-215-573-6233,  office-tel: 1-215-898-5425
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If you make something idiot-proof, the universe creates a better idiot.