Initializing help system before first use

SCALING

Description
This bit vector control determines how the Optimizer will rescale a model internally before optimization. If set to 0, no scaling will take place.
Type
Integer
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 global objective scaling.
13 
RHS scaling.
14 
Disable aggressive quadratic scaling.
15 
Enable explicit linear slack scaling.
Default value
163
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.
Affects routines
XPRSlpoptimize, XPRSlpoptimize, XPRSmipoptimize, XPRSscale ( SCALE).
See also
Scaling, MAXSCALEFACTOR, OBJSCALEFACTOR, AUTOSCALING.

Parent Topic Control Parameters

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