CODEWITHSUNDEEP
pythonconstraint-programmingminizincgecode
Giacomo Gaiani
Giacomo Gaiani

Reputation: 1

Minizinc Gecode parse_error(stderr)

I'm trying to rum my minizinc model through python but it seem to be a problem with the solver Gecode. I've tryed using a simpler model but the result is the same. If i use another solver like chuffed works perfectly.

import minizinc 

model = minizinc.Model()

model.add_string("""
var -100..100: x;
int: a; int: b; int: c;
constraint a*(x`*`x) + b`*`x = c;
solve satisfy;
""")
gecode = minizinc.Solver.lookup("gecode")
inst = minizinc.Instance(gecode, model)
inst["a"] = 1
inst["b"] = 4
inst["c"] = 0
result = inst.solve(all_solutions=True)
for i in range(len(result)):
print("x = {}".format(result[i, "x"]))

This is a tutorial model i've used for testing and this is the error:

result = inst.solve()
File "C:\Users\acer\AppData\Local\Programs\Python\Python310\lib\site-packages\minizinc\instance.py", line 183, in solve`
return asyncio.run(coroutine)
File`"C:\Users\acer\AppData\Local\Programs\Python\Python310\lib\asyncio\runners.py", line 44, in run
return loop.run_until_complete(main)
File "C:\Users\acer\AppData\Local\Programs\Python\Python310\lib\asyncio\base_events.py", line 646, in run_until_complete
return future.result()
File "C:\Users\acer\AppData\Local\Programs\Python\Python310\lib\site-packages\minizinc\instance.py", line 235, in solve_async`
async for result in self.solutions()
File "C:\Users\acer\AppData\Local\Programs\Python\Python310\lib\site-packages\minizinc\instance.py", line 450, in solutions
raise parse_error(stderr)
minizinc.error.MiniZincError: MiniZinc stopped with a non-zero exit code, but did not output an error message.

Upvotes: 0

Views: 178

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