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

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