def to_lp(self):
self.update()
with TemporaryFilename(suffix=".lp") as tmp_file_name:
glp_write_lp(self.problem, None, tmp_file_name)
with open(tmp_file_name) as tmp_file:
lp_form = tmp_file.read()
return lp_form
def to_lp(self):
self.update()
with TemporaryFilename(suffix=".lp") as tmp_file_name:
glp_write_lp(self.problem, None, tmp_file_name)
with open(tmp_file_name) as tmp_file:
lp_form = tmp_file.read()
return lp_form
def __str__(self):
with tempfile.NamedTemporaryFile(suffix=".lp",
delete=True) as tmp_file:
tmp_file_name = tmp_file.name
glp_write_lp(self.problem, None, tmp_file_name)
with open(tmp_file_name) as tmp_file:
cplex_form = tmp_file.read()
return cplex_form
def solve_with_glpsol(glp_prob):
"""Solve glpk problem with glpsol commandline solver. Mainly for testing purposes.
# Examples
# --------
# >>> problem = glp_create_prob()
# ... glp_read_lp(problem, None, "../tests/data/model.lp")
# ... solution = solve_with_glpsol(problem)
# ... print 'asdf'
# 'asdf'
# >>> print solution
# 0.839784
# Returns
# -------
# dict
# A dictionary containing the objective value (key ='objval')
# and variable primals.
"""
from swiglpk import glp_get_row_name, glp_get_col_name, glp_write_lp, glp_get_num_rows, glp_get_num_cols
row_ids = [glp_get_row_name(glp_prob, i) for i in range(1, glp_get_num_rows(glp_prob) + 1)]
col_ids = [glp_get_col_name(glp_prob, i) for i in range(1, glp_get_num_cols(glp_prob) + 1)]
with tempfile.NamedTemporaryFile(suffix=".lp", delete=True) as tmp_file:
tmp_file_name = tmp_file.name
glp_write_lp(glp_prob, None, tmp_file_name)
cmd = ['glpsol', '--lp', tmp_file_name, '-w', tmp_file_name + '.sol', '--log', '/dev/null']
term = check_output(cmd)
log.info(term)
try:
with open(tmp_file_name + '.sol') as sol_handle:
# print sol_handle.read()
solution = dict()
for i, line in enumerate(sol_handle.readlines()):
if i <= 1 or line == '\n':
pass
elif i <= len(row_ids):
solution[row_ids[i - 2]] = line.strip().split(' ')
elif i <= len(row_ids) + len(col_ids) + 1:
solution[col_ids[i - 2 - len(row_ids)]] = line.strip().split(' ')
else:
print(i)
print(line)
raise Exception("Argggh!")
finally:
os.remove(tmp_file_name + ".sol")
return solution
def solve_with_glpsol(glp_prob):
"""Solve glpk problem with glpsol commandline solver. Mainly for testing purposes.
# Examples
# --------
# >>> problem = glp_create_prob()
# ... glp_read_lp(problem, None, "../tests/data/model.lp")
# ... solution = solve_with_glpsol(problem)
# ... print 'asdf'
# 'asdf'
# >>> print solution
# 0.839784
# Returns
# -------
# dict
# A dictionary containing the objective value (key ='objval')
# and variable primals.
"""
from swiglpk import glp_get_row_name, glp_get_col_name, glp_write_lp, glp_get_num_rows, glp_get_num_cols
row_ids = [glp_get_row_name(glp_prob, i) for i in range(1, glp_get_num_rows(glp_prob) + 1)]
col_ids = [glp_get_col_name(glp_prob, i) for i in range(1, glp_get_num_cols(glp_prob) + 1)]
with tempfile.NamedTemporaryFile(suffix=".lp", delete=True) as tmp_file:
tmp_file_name = tmp_file.name
glp_write_lp(glp_prob, None, tmp_file_name)
cmd = ['glpsol', '--lp', tmp_file_name, '-w', tmp_file_name + '.sol', '--log', '/dev/null']
term = check_output(cmd)
log.info(term)
try:
with open(tmp_file_name + '.sol') as sol_handle:
# print sol_handle.read()
solution = dict()
for i, line in enumerate(sol_handle.readlines()):
if i <= 1 or line == '\n':
pass
elif i <= len(row_ids):
solution[row_ids[i - 2]] = line.strip().split(' ')
elif i <= len(row_ids) + len(col_ids) + 1:
solution[col_ids[i - 2 - len(row_ids)]] = line.strip().split(' ')
else:
print(i)
print(line)
raise Exception("Argggh!")
finally:
os.remove(tmp_file_name + ".sol")
return solution
def to_lp(self):
self.update()
with TemporaryFilename(suffix=".lp") as tmp_file_name:
code = glp_write_lp(self.problem, None, tmp_file_name)
if code != 0:
raise Exception("GLPK could not successfully create the LP.")
with open(tmp_file_name) as tmp_file:
lp_form = tmp_file.read()
return lp_form
def to_lp(self):
self.update()
with TemporaryFilename(suffix=".lp") as tmp_file_name:
code = glp_write_lp(self.problem, None, tmp_file_name)
if code != 0:
raise Exception("GLPK could not successfully create the LP.")
with open(tmp_file_name) as tmp_file:
lp_form = tmp_file.read()
return lp_form
def __str__(self):
tmp_file = tempfile.mktemp(suffix=".lp")
glp_write_lp(self.problem, None, tmp_file)
cplex_form = open(tmp_file).read()
return cplex_form
def write_lp_cplex(self, filename):
'''write the lp in CPLEX format'''
if glpk.glp_write_lp(self.lp, None, filename) != 0:
raise RuntimeError('Error saving CLPEX-format LP to {}'.format(filename))
