Beside the GAP builtin debugging facilities (--> Reference: Debugging and Profiling Facilities) homalg provides two ways to debug the computations.
homalg comes with numerous builtin assertion checks. They are activated if the user increases the assertion level using
SetAssertionLevel( level );
(--> Reference: AssertionLevel), where level is one of the values below:
| level | description |
| 0 | no assertion checks whatsoever |
| 3 | "high"-level homological assertions are checked |
| 4 | "mid"-level homological assertions are checked |
| 5 | "low"-level homological assertions are checked |
| 6 | assertions about basic matrix operations are checked (--> Appendices of the MatricesForHomalg package) |
| (these are among the operations often delegated to external systems) | |
In particular, if homalg delegates matrix operations to an external system then SetAssertionLevel( 4 ); can be used to let homalg debug the external system.
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