XPRSgetgencons, XPRSgetgencons64

Purpose

Returns the general constraints y = f(x1, ..., xn, c1, ..., cm) in a given range.

Topic areas

Problem Information, Piecewise Linear and General Constraints

Synopsis

int XPRS_CC XPRSgetgencons(XPRSprob prob, int contype[], int resultant[], int colstart[], int colind[], int maxcols, int *p_ncols, int valstart[], double val[], int maxvals, int *p_nvals, int first, int last);

int XPRS_CC XPRSgetgencons64(XPRSprob prob, int contype[], int resultant[], XPRSint64 colstart[], int colind[], XPRSint64 maxcols, XPRSint64 *p_ncols, XPRSint64 valstart[], double val[], XPRSint64 maxvals, XPRSint64 *p_nvals, int first, int last);

Arguments

prob

The current problem.

contype

NULL if not required or an integer array of length at least last-first+1 which will be filled with 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 which will be filled with the indices of the output variables y. It must be of length at least last-first+1. May be NULL if not required.

colstart

Integer array of length at least last-first+2 which will be filled with the start index of each general constraint in the colind array. May be NULL if not required.

colind

Integer array which will be filled with the indices of the input variables xi. May be NULL if not required.

maxcols

Maximum number of input columns to be retrieved.

p_ncols

Pointer to return the number of input columns in the colind array. If the number of input columns is greater than maxcols, then only maxcols elements will be returned. May be NULL if not required.

valstart

Integer array of length at least last-first+2 which will be filled with the start index of each general constraint in the val array. May be NULL if not required.

val

Integer array which will be filled with the constant values ci. May be NULL if not required.

maxvals

Maximum number of constant values to be retrieved.

p_nvals

Pointer to return the number of constant values in the val array. If the number of constant values is greater than maxvals, then only maxvals elements will be returned.May be NULL if not required.

first

First general constraint in the range.

last

Last general constraint in the range.

Example

The following example retrieves all general constraints:

int ngencons;
int *contype;
int *resultant;
int *colstart;
int *colind;
int maxcols;
int ncols;
int *valstart;
int *val;
int maxvals;
int nvals;
...
XPRSgetdblattrib(prob, XPRS_GENCONS, &ngencons);
XPRSgetgencons(prob, NULL, NULL, NULL, NULL, 0, &maxcols, NULL, NULL, 0, &maxvals, 0, ngencons - 1);
contype = (int*) malloc(ngencons*sizeof(int));
resultant = (int*) malloc(ngencons*sizeof(int));
colstart = (int*) malloc((ngencons+1)*sizeof(int));
colind = (int*) malloc(maxcols*sizeof(int));
valstart = (int*) malloc((ngencons+1)*sizeof(int));
val = (double*) malloc(maxvals*sizeof(double));
XPRSgetgencons(prob, contype, resultant, colstart, colind, maxcols, &ncols, valstart, val, maxvals, &nvals, 0, ngencons - 1);
...

Further information

1. It is possible to obtain just the number of input columns and/or constant values in the range of general constraints by calling this function with maxcols and maxvals set to 0, in which case the required size for the arrays will be returned in p_ncols and p_nvals (one of them may be NULL if only the other is required). In this case it is also possible to query contype and resultant or they can be left NULL.

2. This function cannot be called while the current problem is being solved or when it is in an interrupted state. Use XPRSpostsolve to restore the problem to a non-solving state.

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XPRSgetgencons, XPRSgetgencons64