Initializing help system before first use

XPRSstorecuts, XPRSstorecuts64

Purpose
Stores cuts into the cut pool, but does not apply them to the current node. These cuts must be explicitly loaded into the matrix using XPRSloadcuts before they become active.
Topic area
Cuts
Synopsis
int XPRS_CC XPRSstorecuts(XPRSprob prob, int ncuts, int nodups, const int cuttype[], const char rowtype[], const double rhs[], const int start[], XPRScut cutind[], const int colind[], const double cutcoef[]);

int XPRS_CC XPRSstorecuts64(XPRSprob prob, int ncuts, int nodups, const int cuttype[], const char rowtype[], const double rhs[], const XPRSint64 start[], XPRScut cutind[], const int colind[], const double cutcoef[]);
Arguments
prob 
The current problem.
ncuts 
Number of cuts to add.
nodups 
0 
do not exclude duplicates from the cut pool;
1 
duplicates are to be excluded from the cut pool;
2 
duplicates are to be excluded from the cut pool, ignoring cut type.
cuttype 
Integer array of length ncuts containing the cut types. The cut types can be any integer and are used to identify the cuts.
rowtype 
Character array of length ncuts containing the row types:
L 
indicates a ≤ row;
E 
indicates an = row;
G 
indicates a ≥ row.
rhs 
Double array of length ncuts containing the right hand side elements for the cuts.
start 
Integer array containing offsets into the colind and dmtval arrays indicating the start of each cut. This array is of length ncuts+1 with the last element start[ncuts] being where cut ncuts+1 would start.
cutind 
Array of length ncuts where the pointers to the cuts will be returned.
colind 
Integer array of length start[ncuts] containing the column indices in the cuts.
cutcoef 
Double array of length start[ncuts] containing the matrix values for the cuts.
Related controls
Double
MATRIXTOL 
Tolerance on matrix elements.

Further information
1. XPRSstorecuts can be used to eliminate duplicate cuts. If the nodups parameter is set to 1, the cut pool will be checked for duplicate cuts with a cut type identical to the cuts being added. If a duplicate cut is found the new cut will only be added if its right hand side value makes the cut stronger. If the cut in the pool is weaker than the added cut it will be removed unless it has been applied to an active node of the tree. If nodups is set to 2 the same test is carried out on all cuts, ignoring the cut type.
2. XPRSstorecuts returns a list of the cuts added to the cut pool in the cutind array. If the cut is not added to the cut pool because a stronger cut exits a NULL will be returned. The cutind array can be passed directly to XPRSloadcuts to load the most recently stored cuts into the matrix.
3. The columns and elements of the cuts must be stored contiguously in the colind and dmtval arrays passed to XPRSstorecuts. The starting point of each cut must be stored in the start array. To determine the length of the final cut the start array must be of length ncuts+1 with the last element of this array containing where the cut ncuts+1 would start.
Related topics
XPRSloadcuts Working with the Cut Manager.

Parent Topic Console and Library Functions

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