Initializing help system before first use

# PREPERMUTE

Description | This bit-vector control (see Section Bit-vector controls) specifies whether to randomly permute rows, columns and MIP entities when starting the presolve. With the default value 0, no permutation will take place.
Type | Integer
Topic areas | Presolve, Problem Transformation, Bit-vector
Values |
Bit | Meaning
0 | Permute rows.
1 | Permute columns.
2 | Permute MIP entities. This bit only affects MIP problems.
Default value | 0
Note | Random permutations enable trying out different solution paths when solving a problem. The random seed for the permutations can be set using PREPERMUTESEED. When both PRESORT and PREPERMUTE are enabled, it will sort and then permute the problem.
Affects routines | XPRSlpoptimize ( LPOPTIMIZE), XPRSmipoptimize ( MIPOPTIMIZE).
See also | PREPERMUTESEED, PRESORT, PRESOLVE, MIPPRESOLVE.
Category | Control

Parent Topic Control Parameters

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