Initializing help system before first use

XPRSgetbasis

XPRSgetbasis

Purpose
Returns the current basis into the user's data arrays.
Synopsis
int XPRS_CC XPRSgetbasis(XPRSprob prob, int rstatus[], int cstatus[]);
Arguments
prob 
The current problem.
rstatus 
Integer array of length ROWS to the basis status of the slack, surplus or artificial variable associated with each row. The status will be one of:
0 
slack, surplus or artificial is non-basic at lower bound;
1 
slack, surplus or artificial is basic;
2 
slack or surplus is non-basic at upper bound.
3 
slack or surplus is super-basic.
May be NULL if not required.
cstatus 
Integer array of length COLS to hold the basis status of the columns in the constraint matrix. The status will be one of:
0 
variable is non-basic at lower bound, or superbasic at zero if the variable has no lower bound;
1 
variable is basic;
2 
variable is non-basic at upper bound;
3 
variable is super-basic.
May be NULL if not required.
Example
The following example minimizes a problem before saving the basis for later: 
int rows, cols, *rstatus, *cstatus;
...
XPRSgetintattrib(prob,XPRS_ROWS,&rows);
XPRSgetintattrib(prob,XPRS_COLS,&cols);
rstatus = (int *) malloc(sizeof(int)*rows);
cstatus = (int *) malloc(sizeof(int)*cols);
XPRSlpoptimize(prob,"");
XPRSgetbasis(prob,rstatus,cstatus);
Related topics
XPRSgetpresolvebasis, XPRSloadbasis, XPRSloadpresolvebasis.

Parent Topic Console and Library Functions

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