I would like to get the names of each decision variable after I have run my optimizing programme using Cplex in Python.
I know that there is a function in Matlab for that but I can't find it for Python. Does anybody know if there is such a function?
Thanks!
let me share a small example:
from docplex.mp.model import Model
mdl = Model(name='buses')
nbbus40 = mdl.integer_var(name='nbBus40')
nbbus30 = mdl.integer_var(name='nbBus30')
mdl.add_constraint(nbbus40*40 + nbbus30*30 >= 300, 'kids')
mdl.minimize(nbbus40*500 + nbbus30*400)
mdl.solve()
print(nbbus40.solution_value);
print(nbbus30.solution_value);
print("display")
for v in mdl.iter_integer_vars():
print(v," = ",v.solution_value)
which gives
6.0
2.0
display
nbBus40 = 6.0
nbBus30 = 2.0
With the CPLEX Python API (not to be confused with the DOcplex Modeling for Python API shown in Alex's answer), you can use the Cplex.variables.get_names method. The following toy example reads a model file (given on the command line) and prints out all the names:
import sys
import cplex
if len(sys.argv) != 2:
raise ValueError("usage: {0} <filename>".format(sys.argv[0]))
c = cplex.Cplex(sys.argv[1])
for index, name in enumerate(c.variables.get_names()):
print("variable[{0}] = {1}".format(index, name))
