Initializing help system before first use

problem.addSOS

Purpose
Creates a special ordered set (SOS) constraint within the problem.
Synopsis
s = problem.addSOS(indices, weights, type=1, name='')
Arguments
indices 
List of variables composing the SOS constraint.
weights 
List of weights (one per variable). These define the order for SOS2 constraints and may be used in branching for both types.
type 
Type of the SOS constraint. Can be 1 (default) or 2.
name 
Name of the SOS constraint.
Example 
N = 20
p = xpress.problem()
x = [p.addVariable() for i in range(N)]
s1 = p.addSOS(x, [i+2 for i in range(N)])
s2 = p.addSOS([x[0], x[2]], [4,6])
Further information
Weights must be sufficiently distinct (see the SOSREFTOL control in the Optimizer manual). The addSOS function can also be used to add existing unlinked SOS constraints to a problem. This usage is deprecated. See xpress.sos for examples of using unlinked SOS constraints.

Parent Topic Xpress problem methods

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