Re: [Help-glpk] using about GLPK

[Leandro Barcelos]

Hello Ivkai,

You should use integer statement on variables declaration

The solution is 14.

But
if you have not integers parameters in your objective function, you
can't say that's z will be integer. In this case, add an integer
variable and a constraint witch tells the new variable is equals to you
objective function definition.

#problem.mod

#variables
var x1 >= 0, integer;
var x2 >= 0, integer;
# var x3 >= 0, integer;
#objective
maximize z: 3*x1 + 2*x2;
#constraints
s.t. firstCondition: 2*x1 + 3*x2 <= 14;
s.t. secondCondition: 2*x1 + x2 <= 9;
# s.t. thirdCondition: x3 = 3*x1 + 2*x2;
end;

On 6/2/07, lvkai < address@hidden> wrote:

hello,

how are you?

I want to know how to solve the IP (not normal LP problem,but the problem whose result is Integer)?

I have made the model as follow:



#problem.mod

#variables
var x1 >= 0;
var x2 >= 0;
#objective
maximize z: 3*x1 + 2*x2;
#constraints
s.t. firstCondition: 2*x1 + 3*x2 <= 14;
s.t. secondCondition: 2*x1 + x2 <= 9;
end;



but when I type :glpsol -m problem.mod -o result



the final result is 14.75 but not a interger

can you help me?

thank you!





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Leandro B. Barcelos