Initializing help system before first use

PRESOLVEOPS

Description
This bit-vector control (see Section Bit-vector controls) specifies the operations which are performed during the presolve.
Type
Integer
Topic areas
Presolve, Bit-vector
Values
Bit
Meaning
0 
Singleton column removal.
1 
Singleton row removal.
2 
Forcing row removal.
3 
Dual reductions.
4 
Redundant row removal.
5 
Duplicate column removal.
6 
Duplicate row removal.
7 
Strong dual reductions.
8 
Variable eliminations.
9 
No IP reductions.
10 
No domain changes for MIP entities (e.g., semi-continuous detection or shifting integers).
11 
No advanced IP reductions.
12 
No eliminations on integers.
13 
No reductions based on solution enumeration.
14 
Linearly dependant row removal.
15 
No integer variable and SOS detection.
16 
No implied bounds.
17 
No clique presolve.
18 
No mod2 presolve.
Default value
511 (bits 0 — 8 incl. are set)
Affects routines
XPRSlpoptimize ( LPOPTIMIZE), XPRSmipoptimize ( MIPOPTIMIZE), XPRSpresolverow.
See also
Working with Presolve, PRESOLVE, MIPPRESOLVE.
Category
Control

Parent Topic Control Parameters

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