# Port excitation
Port excitation settings control which port simulations are run and which S-matrix elements can be inferred from symmetry.
# Run Only
run_only: Optional list of S-matrix indices that define which port simulations to run.
- Options:
- None: Run all simulations needed for the full S-matrix.
- Selected entries: Run only the selected S-matrix entries.
- Default: None
# S-Parameter Symmetry
element_mappings: S-matrix element mappings used to skip simulations whose results can be inferred from another matrix element.
Each mapping relates an input element, output element, and complex coefficient.