hole radius exact up to L2 error 9.16e-17
project
projection type: lsqr
solve
solving 60 dof system to machine precision using arnoldi solver
residual decreased by 15.5 orders using 0 krylov vectors
solver returned with residual 1e-16
constrained 60/60 dofs, error 0.00e+00/area
optimize
constrained 12/120 dofs
optimum value 0.00e+00
optimize
solve
solving 18 dof system to machine precision using arnoldi solver
residual decreased by 16.0 orders using 0 krylov vectors
solver returned with residual 2e-17
constrained 30/120 dofs
optimum value 9.74e-08
solve
solving 90 dof system to machine precision using arnoldi solver
residual decreased by 15.5 orders using 0 krylov vectors
residual decreased by 0.1 orders using 1 krylov vectors
residual decreased by 0.1 orders using 2 krylov vectors
solver returned with residual 2e-16
loop _sample_X 88%
RuntimeWarning: singular matrix In /home/docs/checkouts/readthedocs.org/user_builds/nutils/checkouts/latest/nutils/warnings.py:17
stressxx.png
errors: L2=9.49e-05, H1=2.86e-03