Initializing help system before first use

XSLP_PRESOLVEOPS, NLPPRESOLVEOPS

Description
Bitmap indicating the SLP presolve actions to be taken
Type
Integer
Topic areas
Presolve, Bit-vector
Values
Bit
Meaning
0 
Generic SLP presolve.
1 
Explicitly fix columns identified as fixed to zero.
2 
Explicitly fix all columns identified as fixed.
3 
SLP bound tightening.
4 
MISLP bound tightening.
5 
Bound tightening based on function domains.
8 
Do not presolve coefficients.
9 
Do not remove delta variables.
10 
Avoid reductions that can not be dual postsolved.
11 
Allow eliminations on determined variables.
12 
Avoid performing linear reductions at the nlp level.
13 
Avoid simplifying nonlinear expressions.
Default value
2104
Note
The Xpress NonLinear nonlinear presolve (which is carried out once, before augmentation) is independent of the Optimizer presolve (which is carried out during each SLP iteration). Linear reductions are performed according to XPRS_PRESOLVEOPS if bit 12 is not set.
Affects routines
XSLPconstruct, XSLPpresolve
See also
XSLP_PRESOLVELEVEL, XSLP_PRESOLVE, XSLP_PRESOLVEOPS, XSLP_REFORMULATE
Category
Control

Parent Topic Integer control parameters

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