show

Display information about optimization object

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Syntax

show(obj)

Description

Use show to display information about an optimization object.

Tip

For the full workflow, see Problem-Based Optimization Workflow or Problem-Based Workflow for Solving Equations.

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.

example

Examples

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Open Live Script

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);
show(x)
    [ 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);
show(obj)
  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;
show(cons)
  (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);
show(prob)
  OptimizationProblem : 

	Solve for:
       x

	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.

<stopping criteria details>

sol = struct with fields:
    x: [2×1 double]


fval = 
0.0447

exitflag = 
    OptimalSolution

Examine the solution point.

sol.x
ans = 2×1

    0.7864
    0.6177

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

See Also

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