[Chimera-users] Visualizing major and minor axes of inertia

[Felipe Vasquez]

Dear all,

I am interested in visualizing the major and minor axes of inertia of a
ligand in a PDB structure by using UCSF Chimera. Once I calculate the axis
of inertia by entering in command line:

measure inertia sel

I obtained the following info (in reply log):

v1 =  0.985 -0.173 -0.013   a =  6.079   r1 =  2.103
v2 = -0.086 -0.553  0.829   b =  4.564   r2 =  2.765
v3 = -0.150 -0.815 -0.559   c =  1.127   r3 =  3.400
center =   38.682   56.595   62.547

However, I do not still know:

1- What are the major and minor axes of inertia? This info is given by the
"a/b/c" or "r1/r2/r3" values?
2-How can I visualize the major and minor axes of inertia as planes (or
arrows)?

Thanks in advances for your help.

Best regards,


*Andrés Felipe Vásquez J., BSc, MSc.*
PhD candidate in Chemical Engineering
Universidad de los Andes
Bogotá, D.C., Colombia
Carrera 1 #18A-12, Of. ML-754(26)
+57 1 3394949 Ext. 1747
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