Hello everyone
I created the following program or whatever you call it and compile it with no error, however I got zeros in my z solution
Positive variable x1, x2, x3;
free variable z;
Equations
Con1,
Con2,
Con3,
Obj;
;
Con1.. 75*x1 + 131*x2 + 169*x3 =L= 375;
Con2.. 9*x1 + 15*x2 + 20*x3 =L= 44;
Con3.. 7*x1 + 12*x2 + 15*x3 =L= 34;
Obj.. 0.2*x1 + 0.3*x2+ 0.5*x3 =E= z;
Model Time_minimization /
Con1,
Con2,
Con3,
Obj / ;
options lp = cplex;
Solve Time_minimization Using lp Minimizing z;
Display x1.L, x2.L, x3.L, z.L;
can anyone tell me what's wrong with it????
Please help with solver
Re: Please help with solver
Hi
There is nothing wrong with your solution: you have three less-than-or-equal constraints and a to minimize objective equation all with positive coefficients.
This means that {0,0,0} is the minimal and optimal solution. All constraints are met and the objective variable is minimized.
Perhaps you meant greater-than-or-equal in your constraints.
Cheers
Renger
There is nothing wrong with your solution: you have three less-than-or-equal constraints and a to minimize objective equation all with positive coefficients.
This means that {0,0,0} is the minimal and optimal solution. All constraints are met and the objective variable is minimized.
Perhaps you meant greater-than-or-equal in your constraints.
Cheers
Renger
____________________________________
Enjoy modeling even more: Read my blog on modeling at The lazy economist
Enjoy modeling even more: Read my blog on modeling at The lazy economist
Re: Please help with solver
thanks for reply first of allRenger wrote: ↑5 years ago Hi
There is nothing wrong with your solution: you have three less-than-or-equal constraints and a to minimize objective equation all with positive coefficients.
This means that {0,0,0} is the minimal and optimal solution. All constraints are met and the objective variable is minimized.
Perhaps you meant greater-than-or-equal in your constraints.
Cheers
Renger
I go zeros for solution, what should I do to get optimal numbers for the three unknowns??
Re: Please help with solver
Hi
This is the optimal solution imagine a one-dimensional problem: x<5 and z=3x. 0 is the optimal solution.
It would make more sense if you would have >= constraints.
Cheers
Renger
This is the optimal solution imagine a one-dimensional problem: x<5 and z=3x. 0 is the optimal solution.
It would make more sense if you would have >= constraints.
Cheers
Renger
____________________________________
Enjoy modeling even more: Read my blog on modeling at The lazy economist
Enjoy modeling even more: Read my blog on modeling at The lazy economist