Impossible deduce bounds

[N ABDULLAHI]

Hello, Good day all

the attached files are my model and Data, I have been battling this issue of "impossible deduced bounds" can any one help me out to figure out what need to be done is urgent pls

error solve command:

ampl: solve;

presolve, variable open_res['r8',3]:

        impossible deduced bounds: lower = 2, upper = 1;

        difference = 1

presolve, variable open_res['r6',3]:

        impossible deduced bounds: lower = 2, upper = 1;

        difference = 1

presolve, variable open_res['r5',2]:

        impossible deduced bounds: lower = 2, upper = 1;

        difference = 1

presolve, variable open_res['r3',3]:

        impossible deduced bounds: lower = 2, upper = 1;

        difference = 1

presolve, variable open_res['r1',3]:

        impossible deduced bounds: lower = 2, upper = 1;

        difference = 1

1 presolve messages suppressed.

ampl:

Thanks Nasiru Abdullahi

[Victor Zverovich]

The message "impossible deduced bounds" means that the solver detected that your problem is infeasible. If you run

  solexpand;

you'll notice infeasible constraints such as

  subject to six_one['c1',1]:

0 = 1;

You should check these and possibly other constraints to see what is causing infeasibility. See also https://groups.google.com/d/msg/ampl/utuRnIL7RLI/2Aj0zsg0AAAJ

HTH,

Victor

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