How to do Eigenvalue Analysis These are the main reasons for unsuccessful runs Elements with zero mass Elements with zero radii of gyration Too many free degree of freedoms Check the table in <*>_stamod.res for info LINE INFO - Mass and buoyancy data 1. Error message The analysis stops with the error message: S A M Library LANCZ1 Matrix B cannot be factorized This means that the mass matrix cannot be factorized. Tip: Check the masses on elements & bodies used in the model 2. Tip If you have trouble running the eigen value analysis, try to run a short dynamic run If the model is unstable in dynamic analysis, the eigen value analysis will not run How to unpack SIMA from zip Riflex: How to define local element axis