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XPRSaddgencons, XPRSaddgencons64

XPRSaddgencons, XPRSaddgencons64

Purpose
Adds one or more general constraints to the problem. Each general constraint y = f(x1, ..., xn, c1, ..., cn) consists of one or more (input) columns xi, zero or more constant values ci and a resultant (output column) y, different from all xi. General constraints include maximum and minimum (arbitrary number of input columns of any type and arbitrary number of input values, at least one total), and and or (at least one binary input column, no constant values, binary resultant) and absolute value (exactly one input column of arbitrary type, no constant values).
Synopsis
int XPRS_CC XPRSaddgencons(XPRSprob prob, int ngencons, int ncols, int nvals, const int type[], const int resultant[], const int colstart[], const int col[], const int valstart[], const double val[]);

int XPRS_CC XPRSaddgencons64(XPRSprob prob, int ngencons, XPRSint64 ncols, XPRSint64 nvals, const int type[], const int resultant[], const XPRSint64 colstart[], const int col[], const XPRSint64 valstart[], const double val[]);
Arguments
prob 
The current problem.
ngencons 
The number of general constraints to add.
ncols 
The total number of input variables in general constraints that should be added.
nvals 
The total number of constant values in general constraints that should be added.
type 
Integer array of length ngencons containing the types of the general constraints:
XPRS_GENCONS_MAX (0) 
indicates a maximum constraint;
XPRS_GENCONS_MIN (1) 
indicates a minimum constraint;
XPRS_GENCONS_AND (2) 
indicates an and constraint.
XPRS_GENCONS_OR (3) 
indicates an or constraint;
XPRS_GENCONS_ABS (4) 
indicates an absolute value constraint.
resultant 
Integer array of length ngencons containing the indices of the output variables of the general constraints.
colstart 
Integer array of length ngencons containing the start index of each general constraint in the col array.
col 
Integer array of length ncols containing the input variables in all general constraints.
valstart 
Integer array of length ngencons containing the start index of each general constraint in the val array (may be NULL if nvals = 0).
val 
Double array of length nvals containing the constant values in all general constraints (may be NULL if nvals = 0).
Related controls
Integer
GENCONSDUALREDUCTIONS 
Controls whether dual reductions may be applied to reduce the number of added variables and constraints.

Example
This adds two new general constraints x2 = max(x0, x1, 5) and x3 = |x1|: 
int type[] = {XPRS_GENCONS_MAX, XPRS_GENCONS_ABS};
int resultant[] = {2, 3};
int colstart[] = {0, 2};
int col[] = {0, 1, 1};
int valstart[] = {0, 1};
double val[] = {5.0};

...
XPRSaddgencons(prob, 2, 3, 1, type, resultant, colstart, col, valstart, val);
XPRSmipoptimize(prob,"");
Further information
General constraints must be set up before solving the problem. They are converted to additional binary variables, indicator and linear constraints with the exact formulation and number of added entities depending on the performed presolving. Note that using non-binary variables in and/ or constraints or adding constant values to them or absolute value constraints will give an error at solve time.
Related topics
XPRSgetgencons, XPRSdelgencons.

Parent Topic Console and Library Functions

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