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Writing and reading problem files Description Create a few variables, then build a problem and save it to a file.
Re-read that file into a new problem and solve it Further explanation of this example: 'Xpress Python Reference Manual'
Source Files By clicking on a file name, a preview is opened at the bottom of this page.
example_write_read.py
# Create a few variables, then build a problem and save it to a file.
# Re-read that file into a new problem and solve it
#
# (C) Fair Isaac Corp., 1983-2024
from __future__ import print_function
import xpress as xp
m = xp.problem()
c1 = m.addVariable(name="C1", lb=-xp.infinity, ub=xp.infinity)
c2 = m.addVariable(name="C2", lb=-xp.infinity, ub=200)
c3 = m.addVariable(name="C3", vartype=xp.partiallyinteger, threshold=10)
c4 = m.addVariable(name="C4", vartype=xp.semicontinuous, threshold=3, ub=6)
c5 = m.addVariable(name="C5", vartype=xp.integer)
m.setObjective(c1 + c2)
m.addConstraint(c1**2 + c2**2 <= 6,
2 * c1 + 3 * c2 + c3 == 2,
-c3**2 + c4**2 + c5**2 <= 0,
c4 == 0.316227766016838 * c1,
c5 == 0.316227766016838 * c2)
m.write("example0", "lp")
m2 = xp.problem()
m2.read("example0.lp", "")
m2.optimize()
print("objective value:", m2.getObjVal())
print("solution:", m2.getSolution())
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| © Copyright 2024 Fair Isaac Corporation. |
