Initializing help system before first use

XSLP_PROBING

Description
This control determines whether probing on a subset of variables should be performed prior to starting the main algorithm. Probing runs multiple times bound reduction in order to further tighten the bounding box.
Type
Integer
Values
-1 
Automatic.
0 
Disable SLP probing.
1 
Activate SLP probing only on binary variables.
2 
Activate SLP probing only on binary or unbounded integer variables.
3 
Activate SLP probing only on binary or integer variables.
4 
Activate SLP probing only on binary, integer variables, and unbounded continuous variables.
5 
Activate SLP probing on any variable.
Default value
-1: XSLP sets the probing level based on the problem size
Note
The Xpress NonLinear nonlinear probing, which is carried out once, is independent of the Optimizer presolve (which is carried out during each SLP iteration). The probing level allows for probing on an expanding set of variables, allowing for probing on all variables (level 5) or only those for which probing is more likely to be useful (binary variables).
Affects routines
XSLPpresolve
See also
XSLP_PRESOLVEOPS,

Parent Topic Integer control parameters

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