Initializing help system before first use

problem.getSlacks

Purpose
Used to obtain the slack values associated with the incumbent solution during or after optimization with problem.optimize, problem.mipoptimize, problem.lpoptimize or problem.nlpoptimize.
Synopsis
slacks = problem.getSlacks(*constraints)
Argument
constraints 
(optional) constraint objects whose slacks will be returned. If none is provided, a list of slacks for all constraints in the problem will be returned.
Return value
slacks 
A list of slack values if *constraints contains more than one constraint object or is not provided, a single slack value otherwise.
Example 
import xpress as xp
import numpy as np
p = xp.problem()
x = p.addVariables(10)
A = np.random.random((5,10))
b = np.random.random(5)
constr = xp.Dot(A,x) >= b
p.addConstraint(constr)
p.setObjective(xp.Sum(x))
p.optimize()
print("slack of 2nd and 3rd constraint:", p.getSlacks(constr[1], constr[2]))
print("slack of first three constraints:", p.getSlacks(constr[:3]))
Related topics
problem.optimize, problem.getSolution, problem.getDuals, problem.getRedCosts

Parent Topic Xpress problem methods

© 2001-2024 Fair Isaac Corporation. All rights reserved. This documentation is the property of Fair Isaac Corporation (“FICO”). Receipt or possession of this documentation does not convey rights to disclose, reproduce, make derivative works, use, or allow others to use it except solely for internal evaluation purposes to determine whether to purchase a license to the software described in this documentation, or as otherwise set forth in a written software license agreement between you and FICO (or a FICO affiliate). Use of this documentation and the software described in it must conform strictly to the foregoing permitted uses, and no other use is permitted.