Initializing help system before first use

# SCALING

Description | This bit-vector control (see Section Bit-vector controls) determines how the Optimizer will rescale a model internally before optimization. If set to 0, no scaling will take place.
Type | Integer
Topic areas | Numerics, Problem Transformation, Bit-vector
Values |
Bit | Meaning
0 | Row scaling.
1 | Column scaling.
2 | Row scaling again.
3 | Maximum.
4 | Curtis-Reid.
5 | 0: scale by geometric mean. 1: scale by maximum element.
6 | Treat big-M rows as normal rows.
7 | Scale objective function for the simplex method.
8 | Exclude the quadratic part of constraint when calculating scaling factors.
9 | Scale before presolve.
10 | Do not scale rows up.
11 | Do not scale columns down.
12 | Do not apply automatic objective scaling.
13 | RHS scaling.
14 | Disable aggressive quadratic scaling.
15 | Enable explicit linear slack scaling.
Default value | 163, meaning bits 0, 1, 5 and 7 are set
Note | Setting SCALING to 0 will preserve the current scaling of the problem. Note that the Optimizer might automatically select a different scaling strategy, when the control AUTOSCALING is not disabled. However, if SCALING is set to any value by the user, AUTOSCALING will be ignored. The barrier algorithm uses equilibrium scaling.
Affects routines | XPRSlpoptimize, XPRSlpoptimize, XPRSmipoptimize, XPRSscale ( SCALE).
See also | Scaling, MAXSCALEFACTOR, OBJSCALEFACTOR, AUTOSCALING.
Category | Control

Parent Topic Control Parameters

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