Initializing help system before first use

# XPRSloadpresolvebasis

Purpose
Loads a presolved basis from the user's areas.
Topic areas
Data Input, LP
Synopsis
`int XPRS_CC XPRSloadpresolvebasis(XPRSprob prob, const int rowstat[], const int colstat[]);`
Arguments

prob | The current problem.
rowstat | Integer array of length ROWS containing the basis status of the slack, surplus or artificial variable associated with each row. The status must be one of:
XPRS_BASISSTATUS_NONBASIC_LOWER (0) | slack, surplus or artificial is non-basic at lower bound;
XPRS_BASISSTATUS_BASIC (1) | slack, surplus or artificial is basic;
XPRS_BASISSTATUS_NONBASIC_UPPER (2) | slack or surplus is non-basic at upper bound.
colstat | Integer array of length COLS containing the basis status of each of the columns in the matrix. The status must be one of:
XPRS_BASISSTATUS_NONBASIC_LOWER (0) | variable is non-basic at lower bound or superbasic at zero if the variable has no lower bound;
XPRS_BASISSTATUS_BASIC (1) | variable is basic;
XPRS_BASISSTATUS_NONBASIC_UPPER (2) | variable is at upper bound;
XPRS_BASISSTATUS_SUPERBASIC (3) | variable is super-basic.

Example
The following example saves the presolved basis for one problem, loading it into another:

    int rows, cols, *rowstat, *colstat;
    ...
    XPRSreadprob(prob,"myprob","");
    XPRSmipoptimize(prob,"l");
    XPRSgetintattrib(prob,XPRS_ROWS,&rows);
    XPRSgetintattrib(prob,XPRS_COLS,&cols);
    rowstat = malloc(rows*sizeof(int));
    colstat = malloc(cols*sizeof(int));
    XPRSgetpresolvebasis(prob,rowstat,colstat);
    XPRSreadprob(prob2,"myotherprob","");
    XPRSmipoptimize(prob2,"l");
    XPRSloadpresolvebasis(prob2,rowstat,colstat);

Related topics
XPRSgetbasis, XPRSgetpresolvebasis, XPRSloadbasis.
Parent Topic Console and Library Functions

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