Initializing help system before first use

MIPSTOPSTAGE

Description
This control allows stopping a MIP solve in an early stage of the solution process. If the control is set to a stage that is already completed then the next optimization will stop immediately. If the solution process stops due to this control, the STOPSTATUS attribute is set to MIPSTAGE.
Type
Integer
Topic areas
Limits, Branch and Bound Search
Values
0 
MIPSTOPSTAGE_NONE— Do not stop at an early stage of the solve.
1 
MIPSTOPSTAGE_PRESOLVE— Stop after presolve.
2 
MIPSTOPSTAGE_PREROOTHEURS— Stop after heuristics run before the initial relaxation.
3 
MIPSTOPSTAGE_INITIALRELAXATION— Stop after solving the initial relaxation.
4 
MIPSTOPSTAGE_ROOT— Stop at the end of the root node.
Default value
0
Note

For a single objective MIP, a sequence like MIPSTOPSTAGE=PRESOLVE, optimize(), MIPSTOPSTAGE=PREROOTHEURS, optimize(), MIPSTOPSTAGE=INITIALRELAXATION, optimize(), MIPSTOPSTAGE=ROOT, optimize(), essentially steps through the early stages of a solve.

This stepping will not work for multi-objective problems since a multi-objective solve always starts from the initial stage of the first objective.

Affects routines
XPRSoptimize ( OPTIMIZE).
Category
Control

Parent Topic Control Parameters

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