PREPERMUTE

This bit vector control specifies whether to randomly permute rows, columns and global information when starting the presolve. With the default value 0, no permutation will take place.

Integer

Bit	Meaning
0	Permute rows.
1	Permute columns.
2	Permute global information. This bit only affects MIP problems.

0

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.

XPRSlpoptimize ( LPOPTIMIZE), XPRSmipoptimize ( MIPOPTIMIZE).

PREPERMUTESEED, PRESORT, PRESOLVE, MIPPRESOLVE.