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Display information about optimization object

Since R2019b



Use show to display information about an optimization object.


show(obj) displays information about obj at the command line. If the object display is large, consider using write instead to save the information in a text file.


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Examine the various stages of problem construction for optimizing the Rosenbrock function confined to the unit disk (see Solve a Constrained Nonlinear Problem, Problem-Based).

Create a 2-D optimization variable x. Show the variable.

x = optimvar('x',2);
    [ x(1) ]
    [ x(2) ]

Create an expression for the objective function. Show the expression.

obj = log(1 + 100*(x(2) - x(1)^2)^2 + (1 - x(1))^2);
  log(((1 + (100 .* (x(2) - x(1).^2).^2)) + (1 - x(1)).^2))

Create an expression for the constraint. Show the constraint.

cons = x(1)^2 + x(2)^2 <= 1;
  (x(1).^2 + x(2).^2) <= 1

Create an optimization problem that has obj as the objective function and cons as the constraint. Show the problem.

prob = optimproblem("Objective",obj,"Constraints",cons);
  OptimizationProblem : 

	Solve for:

	minimize :
       log(((1 + (100 .* (x(2) - x(1).^2).^2)) + (1 - x(1)).^2))

	subject to :
       (x(1).^2 + x(2).^2) <= 1

Finally, create an initial point [0 0] and solve the problem starting at the initial point.

x0.x = [0 0];
[sol,fval,exitflag] = solve(prob,x0)
Solving problem using fmincon.

Local minimum found that satisfies the constraints.

Optimization completed because the objective function is non-decreasing in 
feasible directions, to within the value of the optimality tolerance,
and constraints are satisfied to within the value of the constraint tolerance.
sol = struct with fields:
    x: [2x1 double]

fval = 0.0447
exitflag = 

Examine the solution point.

ans = 2×1


Input Arguments

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Optimization object, specified as one of the following:

  • OptimizationProblem object — show(obj) displays the variables for the solution, objective function, constraints, and variable bounds.

  • EquationProblem object — show(obj) displays the variables for the solution, equations for the solution, and variable bounds.

  • OptimizationExpression object — show(obj) displays the optimization expression.

  • OptimizationVariable object — show(obj) displays the optimization variables. This display does not indicate variable types or bounds; it shows only the variable dimensions and index names (if any).

  • OptimizationConstraint object — show(obj) displays the constraint expression.

  • OptimizationEquality object — show(obj) displays the equality expression.

  • OptimizationInequality object — show(obj) displays the inequality expression.

Version History

Introduced in R2019b