Initializing help system before first use

IISOPS

Description
Selects which part of the restrictions (bounds, constraints, entities) should always be kept in an IIS. This is useful if certain types of restrictions cannot be violated, thus they are known not to be the cause of infeasibility. The IIS obtained this way is irreducible only for the non-protected restrictions. This bit-vector control (see Section Bit-vector controls) has an effect only on the deletion filter of the IIS procedure.
Type
Integer
Topic areas
Infeasibility, Bit-vector
Values
Bit
Meaning
0 
Keep binary integralities.
1 
Keep the 0 lower bounds of variables.
2 
Keep fixed variables.
3 
Keep all variable bounds.
4 
Keep all general integer entities, except binaries.
5 
Keep all equality constraints.
6 
Keep all general constraints.
7 
Keep all piecewise linear constraints.
8 
Keep all specially ordered set (SOS) constraints.
9 
Keep all indicator constraints.
10 
Keep all delayed rows.
11 
Keep all constraints.
Default value
0, all restrictions are valid candidates for removal
Affects routines
XPRSiisfirst ( IIS).
Category
Control

Parent Topic Control Parameters

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