# -*- coding: utf-8 -*-
import cplex
from cplex.exceptions import CplexError
# data common to all populateby functions
my_obj = [1.0, 2.0, 3.0]
my_ub = [40.0, cplex.infinity, cplex.infinity]
my_lb = [0.0, 0.0, 0.0]
my_ctype = "CCC"
my_colnames = ["x1", "x2", "x3"]
my_rhs = [20.0, 30.0]
my_rownames = ["r1", "r2"]
my_sense = "LL"
def populatebyrow(prob):
prob.objective.set_sense(prob.objective.sense.maximize)
prob.variables.add(obj=my_obj, lb=my_lb, ub=my_ub, types=my_ctype,
names=my_colnames)
rows = [[["x1", "x2", "x3"], [-1.0, 1.0, 1.0]],
[["x1", "x2", "x3"], [1.0, -3.0, 1.0]]
prob.linear_constraints.add(lin_expr=rows, senses=my_sense,
rhs=my_rhs, names=my_rownames)
my_prob = cplex.Cplex()
handle = populatebyrow(my_prob)
my_prob.solve()
except CplexError as exc:
print(exc)
print()
# solution.get_status() returns an integer code
print("Solution status = ", my_prob.solution.get_status(), ":")
# the following line prints the corresponding string
print(my_prob.solution.status[my_prob.solution.get_status()])
print("Solution value = ", my_prob.solution.get_objective_value())
numcols = my_prob.variables.get_num()
numrows = my_prob.linear_constraints.get_num()
slack = my_prob.solution.get_linear_slacks()
x = my_prob.solution.get_values()
print('x: ')
print(x)
