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#     Copyright (C) 2010-2023 Joel Andersson, Joris Gillis, Moritz Diehl, KU Leuven.
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from casadi import *

"""
This example demonstrates how NL-files, which can be generated
by AMPl or Pyomo, can be imported in CasADi and solved using
e.g. the interface to AMPL

Joel Andersson
2012

"""

# Create an NLP instance
nl = NlpBuilder()

# Parse an NL-file
nl.import_nl("../nl_files/hs107.nl",{"verbose":False})

# NLP solver options
opts = {}
opts["expand"] = True
# opts["verbose"] = True
# opts["ipopt"] = dict(max_iter=10, linear_solver="ma57", hessian_approximation="limited-memory")

# Create an NLP solver
nlpsol = nlpsol("nlpsol", "ipopt", nl, opts)

# Solve NLP
res = nlpsol(lbx=nl.x_lb,
             ubx=nl.x_ub,
             lbg=nl.g_lb,
             ubg=nl.g_ub,
             x0=nl.x_init)