Initializing help system before first use

XSLP_PRESOLVE, NLPPRESOLVE

Description
This control determines whether presolving should be performed on the nonlinear problem prior to starting the main algorithm
Type
Integer
Topic area
Presolve
Values
-1 
Disable nonlinear presolve if and only if Optimizer presolve is disabled.
0 
Disable nonlinear presolve.
1 
Activate nonlinear presolve.
2 
Low memory presolve. Original problem is not restored by postsolve and dual solution may not be completely postsolved.
Default value
-1
Note
The Xpress NonLinear nonlinear presolve (which is carried out once, before augmentation in SLP or introducing auxiliaries in global) is independent of the Optimizer presolve (which is carried out during each SLP iteration or after introducing auxiliaries for a global solve).
Affects routines
XSLPconstruct, XSLPpresolve
See also
XSLP_PRESOLVELEVEL, XSLP_PRESOLVEOPS, XSLP_REFORMULATE
Category
Control

Parent Topic Integer control parameters

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