Initializing help system before first use

PRESORT

Description
This bit-vector control (see Section Bit-vector controls) specifies whether to sort rows, columns and MIP entities by their names when starting the presolve. With the default value 0, no sorting will take place.
Type
Integer
Topic areas
Presolve, Problem Transformation, Bit-vector
Values
Bit
Meaning
0 
Sort rows.
1 
Sort columns.
2 
Sort MIP entities. This bit only affects MIP problems.
Default value
0
Note
Sorting a problem by names can help obtain the same solution path when the rows, columns or MIP entities of the problem is rearranged. It is recommended to enable all three bits when sorting a problem. When both PRESORT and PREPERMUTE are enabled, it will sort and then permute the problem.
Affects routines
XPRSlpoptimize ( LPOPTIMIZE), XPRSmipoptimize ( MIPOPTIMIZE).
See also
PREPERMUTE, PRESOLVE, MIPPRESOLVE.
Category
Control

Parent Topic Control Parameters

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