Initializing help system before first use

xpress.sos

Purpose
Python object class for Special Order Sets (SOS). An SOS is a modeling tool for constraining a small number of consecutive variables in a vector to be nonzero.
Synopsis
s = xpress.sos(indices, weights, type=1, name='')
Arguments
indices 
List of variables composing the SOS.
weights 
List of weights (one per variable).
type 
Type of SOS. Can be 1 (default) or 2.
name 
Name of the SOS.
Example
The following are example declarations of SOS: 
set1 = xp.sos(x, [0.5 + i*0.1 for i in range(10)], type=2)
set2 = xp.sos([y[i] for i in range(5)], [i+1 for i in range(5)])
set3 = xp.sos([v1, v2], [2, 5], 2, "mysos")
One or more SOS can be added to a problem via the addSOS method: 
set1 = xp.sos(x, [0.5 + i*0.1 for i in range(10)], type=2)
m.addSOS(set1)
n = 10
w = [xp.var() for i in range(n)]
m.addSOS ([xpr.sos([w[i],w[i+1]], [2,3], type=2) for i in range(n-1)])
Related topics
problem.addSOS.

Parent Topic Xpress base classes

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