Desperately seeking the unconstrained DOF

[lcpt]

Hi, there.

When you forget to constraint the rotation of a beam around its axis or forget that a truss has no rotational stiffness, you get a message like this:

XC::BandSPDLinLapackSolver::solve; WARNING - the LAPACK routines returned 6
XC::Linear::resuelve; WARNING the XC::BandSPDLinSOE failed in solve()
XC::StaticAnalysis::solve_current_step; the Algorithm failed at step: 0 with domain at load factor 1

When trying to compute the solution.

I've written some recipes here that can help to solve this problem.