# Example of the loadproblem() functionality. # # (C) Fair Isaac Corp., 1983-2024 import xpress as xp p = xp.problem() # fill in a problem with three variables and four constraints p.loadproblem("", # probname ['G', 'G', 'E', 'L'], # qrtypes [-2.4, -3, 4, 5], # rhs None, # range [3, 4, 5], # obj [0, 2, 4, 8], # mstart None, # mnel [0, 1, 2, 3, 0, 1, 2, 3], # mrwind [1, 1, 1, 1, 1, 1, 1, 1], # dmatval [-1, -1, -1], # lb [3, 5, 8], # ub colnames=['x1', 'x2', 'x3'], # column names rownames=['row1', 'row2', 'row3', 'constr_04']) # row names p.write("loadlp", "lp") p.optimize() # Create another variable and add it, then modify the objective # function. Note that the objective function is replaced by, not # amended with, the new objective x = xp.var() p.addVariable(x) p.setObjective(x**2 + 2*x + 444) p.optimize() p.write("updated", "lp")