def read_solution(ampl_filename, sol_filename):
"""
Read the solution of the model *ampl_filename* from *sol_filename*
and returns the objective value.
"""
sol = Solution()
dirname, filename = os.path.split(ampl_filename)
with AMPL(dirname) as ampl:
ampl.eval('model "{}";'.format(ampl_filename))
ampl.eval('solution "{}";'.format(sol_filename))
try:
sol.obj = float(ampl.eval_expr('_obj[1]'))
except AMPLError as e:
sol.obj = 'nan'
sol.obj_error = str(e)
sol.solve_result = ampl.eval_expr('solve_result')
sol.solve_message = ampl.eval_expr('solve_message')
return sol
def test_ampl_cwd():
ampl = util.AMPL()
assert ampl.cwd is None
dirname = tempfile.mkdtemp()
try:
with util.AMPL(dirname) as ampl:
assert dirname in ampl.eval('cd;')[0][1]
finally:
os.rmdir(dirname)
def read_solution(ampl_filename, sol_filename):
"""
Read the solution of the model *ampl_filename* from *sol_filename*
and returns the objective value.
"""
sol = Solution()
dirname, filename = os.path.split(ampl_filename)
with AMPL(dirname) as ampl:
ampl.eval('model "{}";'.format(ampl_filename))
ampl.eval('solution "{}";'.format(sol_filename))
try:
sol.obj = float(ampl.eval_expr('_obj[1]'))
except AMPLError as e:
sol.obj = 'nan'
sol.obj_error = str(e)
sol.solve_result = ampl.eval_expr('solve_result')
sol.solve_message = ampl.eval_expr('solve_message')
return sol
def test_ampl_cwd():
ampl = util.AMPL()
assert ampl.cwd is None
dirname = tempfile.mkdtemp()
try:
with util.AMPL(dirname) as ampl:
assert dirname in ampl.eval('cd;')[0][1]
finally:
os.rmdir(dirname)
def test_ampl():
with util.AMPL() as ampl:
assert ampl.eval('print 42;') == [('print', '42\n')]
assert ampl.eval_expr(42) == 42
def test_ampl():
with util.AMPL() as ampl:
assert ampl.eval('print 42;') == [('print', '42\n')]
assert ampl.eval_expr(42) == 42