XPRBnewsum

Purpose

Create a sum constraint.

Synopsis

XPRBctr XPRBnewsum(XPRBprob prob, const char *name, XPRBarrvar av, int type, double rhs);

Arguments

prob

Reference to a problem.

name

The constraint name (of unlimited length). May be NULL if not required.

Reference to an array of variables.

type

Type of the constraint, which must be one of:

XPRB_L	`less than or equal to' constraint;
XPRB_G	'greater than or equal to' constraint;
XPRB_E	equality;
XPRB_N	a non-binding row (objective function).

rhs

Right hand side value of the constraint.

Return value

Reference to the new constraint if function executed successfully, NULL otherwise.

Example

The following creates a new constraint, ctr2, given by ∑_i=0⁴ ty1_i = 9.

XPRBprob prob;
XPRBctr ctr2;
XPRBarrvar ty1;
   ...
ty1 = XPRBnewarrvar(prob, 5, XPRB_PL, "arry1", 0, 500);
ctr2 = XPRBnewsum(prob, "r2", ty1, XPRB_E, 9);

Further information

This function creates a simple sum constraint over all entries of an array of variables. It replaces calls to XPRBnewctr and XPRBaddterm. If the indicated name is already in use, BCL adds an index to it. If no constraint name is given, BCL generates a default name starting with CTR. (The generation of unique names will only take place if the names dictionary is enabled, see XPRBsetdictionarysize.)

Note:: all terms that are added to a constraint must belong to the same problem as the constraint itself.

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XPRBnewsum

XPRBnewsum