XPRBsetsosdir

Purpose

Set a branching directive for a SOS.

Synopsis

int XPRBsetsosdir(XPRBsos sos, int type, double val);

Arguments

sos

Reference to a previously created SOS.

type

The directive type, which must be one of:

XPRB_PR	priority;
XPRB_UP	first branch upwards;
XPRB_DN	first branch downwards;
XPRB_PU	pseudo cost on branching upwards;
XPRB_PD	pseudo cost on branching downwards.

val

An argument dependent on the type of the directive being defined. If type is:

XPRB_PR	val will be the priority value, an integer between 1 (highest) and 1000 (lowest), the default;
XPRB_UP	no input is required — choose any value, e.g. 0;
XPRB_DN	no input is required — choose any value, e.g. 0;
XPRB_PU	val will be the value of the pseudo cost for the upward branch;
XPRB_PD	val will be the value of the pseudo cost for the downward branch.

Return value

0 if function executed successfully, 1 otherwise.

Example

XPRBprob prob;
XPRBsos set1;
   ...
set1 = XPRBnewsos(prob, "sos1", XPRB_S1);
XPRBsetsosdir(set1, 5);
XPRBsetsosdir(set1, XPRB_DN, 0);

This gives a priority of 5 to the SOS set1 and sets branching downwards as the preferred direction for set1.

Further information

This function sets any type of branching directive available in Xpress. This may be a priority for branching on a SOS (type XPRB_PR), the preferred branching direction (types XPRB_UP, XPRB_DN) or the estimated cost incurred when branching on a SOS (types XPRB_PU, XPRB_PD). Several directives of different types may be set for a single set. Function XPRBsetvardir may be used to set a directive for a variable.

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XPRBsetsosdir

XPRBsetsosdir