main.py

# This is a sample Python script.

# Press ⌃R to execute it or replace it with your code.
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import gurobipy as gp
import matplotlib.pyplot as pyplot
from gurobipy import GRB
import numpy as np
import scipy.sparse as sp

try:
    # model = gp.Model("mip1")
    #
    # x = model.addVar(vtype=GRB.BINARY, name="x")
    # y = model.addVar(vtype=GRB.BINARY, name="y")
    # z = model.addVar(vtype=GRB.BINARY, name="z")
    #
    # model.setObjective(x + y + 2*z, GRB.MAXIMIZE)
    #
    # model.addConstr(x + 2*y + 3*z <= 4, "c0")
    # model.addConstr(x + y >= 1, "c1")
    #
    # model.optimize()
    #
    # for v in model.getVars():
    #     print('%s %g' % (v.VarName, v.X))
    #
    # print('Obj: %g' % model.ObjVal)

    # m = gp.Model("matrix1")
    # x = m.addMVar(shape=3, vtype=GRB.BINARY, name="x")
    # obj = np.array([1.0, 1.0, 2.0])
    # m.setObjective(obj @ x, GRB.MAXIMIZE)
    #
    # val = np.array([1.0, 2.0, 3.0, -1.0, -1.0])
    # row = np.array([0, 0, 0, 1, 1])
    # col = np.array([0, 1, 2, 0, 1])
    #
    # A = sp.csr_matrix((val, (row, col)), shape=(2,3))
    # rhs = np.array([4.0, -1.0])
    # m.addConstr(A @ x <= rhs, name="c")
    #
    # m.optimize()
    #
    # print(x.X)
    # print('Obj: %g' % m.ObjVal)

except gp.GurobiError as e:
    print('Error code ' + str(e.errno) + ': ' + str(e))

except AttributeError:
    print('Encountered an attribute error')