Why Can’T Solver Find A Feasible Solution?

What is feasible and infeasible solutions?

A linear program is infeasible if there exists no solution that satisfies all of the constraints — in other words, if no feasible solution can be constructed.

Since any real operation that you are modelling must remain within the constraints of reality, infeasibility most often indicates an error of some kind..

When a model has a unique optimal solution it means that?

Unique optimal solution. When a model has a unique optimal solution, it means that there is exactly one solution. that will result in the maximum (or minimum) objective.

What is the difference between feasible solution and optimal solution?

A solution (set of values for the decision variables) for which all of the constraints in the Solver model are satisfied is called a feasible solution. … An optimal solution is a feasible solution where the objective function reaches its maximum (or minimum) value – for example, the most profit or the least cost.

What does infeasible mean?

: not feasible : impracticable.

What is feasible solution of LPP?

Definition: A feasible solution to a linear program is a solution that satisfies all constraints. … Definition: An optimal solution to a linear program is the feasible solution with the largest objective function value (for a maximization problem).

How do you know if a solution is feasible?

If the result of a requirement is within the bounds of the requirement, the result is requirement-feasible. If the result is outside the bounds of the requirement, the solution is requirement-infeasible. The OptQuest Engine makes finding a feasible solution its highest priority.

How do I get reports from solver?

Define and solve a problem. A list of reports appears in the Reports box of the Solver Results dialog box. … Click to select one or more reports. … Select any other options you want in the Solver Results dialog box, and click OK.

How do you set objectives in solver?

Excel Solver – Define and Solve a ProblemClick the Solver command to display the Solver Parameters dialog. … In the Set Objective box, enter a cell reference or name for the objective cell. … In the By Changing Variable Cells box, enter a name or reference for each decision variable cell.More items…

What is infeasible solution in simplex method?

An infeasible problem is a problem that has no solution while an unbounded problem is one where the constraints do not restrict the objective function and the optimal objective goes to infinity.

Is the optimal solution unique?

(b) A feasible solution x is the unique optimal solution if and only if c’d > 0 for every nonzero feasible direction d at x. … Suppose that x, a feasible solution, is unique optimal. Then this means that for any y E P such that y + x, then c’x < c'y. Let d be any nonzero feasible direct at x.

What is degenerate basic feasible solution?

Degenerac. Page 1. A Degenerate LP. An LP is degenerate if in a basic feasible solution, one of the basic variables takes on a zero value. Degeneracy is a problem in practice, because it makes the simplex algorithm slower.

What is feasible solution in greedy method?

General method: Given n inputs choose a sub- set that satisfies some constraints. – A subset that satisfies the constraints is called a feasible solution. – A feasible solution that maximises or min- imises a given (objective) function is said to be optimal.

Why can’t solver find a feasible solution?

This message appears when Solver could not find any combination of values for the decision variables that allows all of the constraints to be satisfied simultaneously. If you are using the Simplex LP Solving method, and the model is well scaled, Solver has determined for certain that there is no feasible solution.