XPRSgetglobal, XPRSgetglobal64

Purpose

Retrieves global information about a problem. It must be called before XPRSmipoptimize if the presolve option is used.

Synopsis

int XPRS_CC XPRSgetglobal(XPRSprob prob, int *nglents, int *sets, char qgtype[], int mgcols[], double dlim[], char qstype[], int msstart[], int mscols[], double dref[]);

int XPRS_CC XPRSgetglobal64(XPRSprob prob, int *nglents, int *sets, char qgtype[], int mgcols[], double dlim[], char qstype[], XPRSint64 msstart[], int mscols[], double dref[]);

Arguments

prob

The current problem.

nglents

Pointer to the integer where the number of binary, integer, semi-continuous, semi-continuous integer and partial integer entities will be returned. This is equal to the problem attribute MIPENTS.

sets

Pointer to the integer where the number of SOS1 and SOS2 sets will be returned. It can be retrieved from the problem attribute SETS.

qgtype

Character array of length nglents where the entity types will be returned. The types will be one of:

B	binary variables;
I	integer variables;
P	partial integer variables;
S	semi-continuous variables;
R	semi-continuous integer variables.

mgcols

Integer array of length nglents where the column indices of the global entities will be returned.

dlim

Double array of length nglents where the limits for the partial integer variables and lower bounds for the semi-continuous and semi-continuous integer variables will be returned (any entries in the positions corresponding to binary and integer variables will be meaningless).

qstype

Character array of length sets where the set types will be returned. The set types will be one of:

1	SOS1 type sets;
2	SOS2 type sets.

msstart

Integer array where the offsets into the mscols and dref arrays indicating the start of the sets will be returned. This array must be of length sets+1, the final element will contain the offset where set sets+1 would start and equals the length of the mscols and dref arrays, SETMEMBERS.

mscols

Integer array of length SETMEMBERS where the columns in each set will be returned.

dref

Double array of length SETMEMBERS where the reference row entries for each member of the sets will be returned.

Example

The following obtains the global variables and their types in the arrays mgcols and qrtype:

int nglents, nsets, *mgcols;
char *qgtype;
...
XPRSgetglobal(prob,&nglents,&nsets,NULL,NULL,NULL,NULL,
              NULL,NULL,NULL);
mgcols = malloc(nglents*sizeof(int));
qgtype = malloc(nglents*sizeof(char));
XPRSgetglobal(prob,&nglents,&nsets,qgtype,ngcols,NULL,
              NULL,NULL,NULL,NULL);

Further information

Any of the arguments except prob, nglents and sets may be NULL if not required.

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XPRSgetglobal, XPRSgetglobal64

XPRSgetglobal, XPRSgetglobal64