This parameter allows you to choose the type of algorithm invoked by LINGO’s linear solver. At present, LINGO offers the following four options:

SOLVEL

Value

Linear Solver

Algorithm

0

LINGO chooses

1

Primal simplex

2

Dual simplex

3

Barrier (only available as an option)

In general, it is difficult to say what algorithm will be fastest for a particular model. A rough guideline is that primal simplex tends to do better on sparse models with fewer rows than columns; the dual does well on sparse models with fewer columns than rows; and the barrier works best on densely structured models or very large models.

The barrier solver is available only as an additional option to the LINGO package.

LINGO defaults to 0, LINGO chooses.