**Solver** |
**Option** |
**Notes** |

LBA |
Hide unconverged modes |
Note that *eigenvector not converged* cases are considered as converged if the buckling factor has converged. |

Hide negative modes |
In linear buckling analysis, a negative buckling factor means that a load reversal is required to produce that buckling mode. If a load reversal is not possible for the structure, the negative modes can be ignored. |

NFA |
Hide unconverged modes |
Normally we require all modes to be converged, but unconverged modes can be selectively excluded in mode superposition, particularly if the unconverged modes do not contribute significantly to the response. |

Hide zero modes |
A zero frequency usually indicates a free body response (i.e., a rigid body mode where the structure, or part of the structure, is moving without deforming). Zero frequencies are expected in the natural frequency analysis of unrestrained structures (in a 3D unrestrained structure there will be six zero frequencies). The modes corresponding to zero frequency are not usually relevant to dynamic analysis, so they can be hidden. |

Hide modes with mass participation below % |
This option hides modes with mass participation below a set value, enabling the post-processing to focus on the modes that contribute the most to a mode superposition result (such as harmonic or spectral response). |

SRA |
Hide modal results |
Modal results are always stored in the spectral response result file, but usually we are interested mainly in the SRSS and/or CQC results, which are produced by combining the modal results. By hiding the modal results, the number of result cases in post-processing is significantly reduced, making it easier to focus on the combined results of interest. |

NLA/QSA/NTA |
Hide unconverged results |
As long as an unconverged result does not influence a subsequent result, it may be acceptable to ignore those unconverged results, particularly unconverged intermediate sub-steps. |

Hide intermediate sub-steps |
All of these solvers allow for automatic sub-stepping to help achieve convergence. These automatic sub-step results can be optionally saved in the result file. If they have been saved, but are not necessary for post-processing, they can be hidden. |