CPXchgcoeflist

Description

The routine CPXchgcoeflist() is used to change a list of matrix coefficients of a CPLEX problem object. The list is prepared as a set of triples (i, j, value), where i is the row index, j is the column index, and value is the new value. The list may be in any order.

The corresponding rows and columns must already exist in the CPLEX problem object. This routine cannot be used to change objective, right-hand side, range, or bound coefficients. Duplicate entries, that is, two triplets with identical i and j, are not allowed.

The routine returns a zero on success, and a nonzero if an error occurs.

int CPXchgcoeflist (CPXCENVptr env, CPXLPptr lp, int numcoefs, const int *rowlist, const int *collist, const double *vallist);

Arguments

The pointer to the CPLEX environment as returned by CPXopenCPLEX().

A pointer to a CPLEX problem object as returned by CPXcreateprob().

The number of coefficients to change, or, equivalently, the length of the arrays rowlist, collist, and vallist.

Arrays of length numcoefs that describe the list of coefficients to change. The entries rowlist[k], collist[k], and vallist[k] indicate that the matrix coefficient in row rowlist[k] and column collist[k] should be changed to the value vallist[k].

status = CPXchgcoeflist (env, lp, numcoefs, rowlist, collist, vallist);