Zerolength element with only torsional stiffness

[amazingcharlie]

I would like to use the zerolength element with only torsional stiffness. Say I only have two nodes in a 3D space and the zerolength element connecting the two nodes only have a material properties associated in dir 6. One node is completely fixed and the other node is fixed in all directions but dir 6 (and there is a rotary inertia assigned as this node). However, somehow the stiffness matrix was just not created when I tried to do a simple eigenvalue analysis. Does anyone have experience with this problem or similar problems?

[mhscott]

That should work. Can you post your code for the minimal working example you described?

[amazingcharlie]

That should work. Can you post your code for the minimal working example you described?

I found out that the problem was with the standard eigen command. I used fullGenLapack instead (I found this in another thread) and now it worked!
Thank you anyways Professor Scott!