
id NOS5 set LANPRO collctn HarwellBoeing problem linear system field real symm symmetric positive definite struct sparse storage sparse assembled shape square rows 468 cols 468 nnzero 2820 nrhs 0 exact 0 guess 0 for 3 story building with attached tower. Each beam is modeled as a finite element approximation to biharmonic operator with one end free and one end fixed. 80 elements with 3 DOF per node. 