The branch-and-bound solver has a great deal of freedom in deciding how to span the branch-and-bound solution tree. NODESL, the node selection option, allows you to control the order in which the solver selects branch nodes in the tree.

The four choices available for NODESL are as follows:

NODESL Setting

Branch Selection

0

LINGO Decides —This is the default option. LINGO makes an educated guess as to the best node to branch on.

1

Depth First — LINGO spans the branch-and-bound tree using a depth first strategy.

2

Worst Bound — LINGO picks the node with the worst bound.

3

Best Bound — LINGO picks the node with the best bound.

In general, LINGO Decides will offer the best results. Experimentation with the other options may be beneficial with some classes of models.