LU Factor Tolerance

Type : Floating point number

Range : [1,1e20] + {na}

Default : na

This option affects the stability and sparsity of the basis factorization B = LU during refactorization. Smaller values for this option favor stability, while larger values favor sparsity. The default value usually strikes a good compromise.

The default value of this option depends on the model class of the problem. For LP models it is 100.0 and for NLP it is 3.99.

For certain very regular structures (e.g., band matrices) it may be necessary to reduce the value of this option (and that of option LU Update Tolerance ) in order to achieve stability.

Learn more about

• LU Update Tolerance