迭代输出
迭代显示的类型
迭代显示为您提供了有关求解器在运行过程中的进度的信息。
迭代显示有两种类型：
全局求解器显示
局部求解器显示
两种类型都会出现在命令行中，取决于全局和局部选项。
通过将 Display 字段中的 problem.options 选项设置为 'iter' 或 'iter-detailed' 与 optimoptions 来获得局部求解器迭代显示。有关详细信息，请参阅迭代输出。
通过将 GlobalSearch 或 MultiStart 对象中的 Display 属性设置为 'iter' 来获得全局求解器迭代显示。
全局求解器将局部求解器的默认 Display 选项设置为 'off'，除非问题结构体具有此选项的值。全局求解器不会覆盖您对局部选项所做的任何设置。
注意
将局部求解器 Display 选项设置为 'off' 以外的任何值都可以产生大量输出。Display 创建的默认 optimoptions(@ 选项是 solver)'final'。
检查迭代显示的类型
使用 GlobalSearch 和 GlobalSearch 迭代显示运行 运行求解器 中描述的示例：
% Set the random stream to get exactly the same output % rng(14,'twister') gs = GlobalSearch('Display','iter'); opts = optimoptions(@fmincon,'Algorithm','interior-point'); sixmin = @(x)(4*x(1)^2 - 2.1*x(1)^4 + x(1)^6/3 ... + x(1)*x(2) - 4*x(2)^2 + 4*x(2)^4); problem = createOptimProblem('fmincon','x0',[-1,2],... 'objective',sixmin,'lb',[-3,-3],'ub',[3,3],... 'options',opts); [xming,fming,flagg,outptg,manyminsg] = run(gs,problem);
Num Pts Best Current Threshold Local Local
Analyzed F-count f(x) Penalty Penalty f(x) exitflag Procedure
0 34 -1.032 -1.032 1 Initial Point
200 1275 -1.032 -0.2155 1 Stage 1 Local
300 1377 -1.032 248.7 -0.2137 Stage 2 Search
400 1477 -1.032 278 1.134 Stage 2 Search
446 1561 -1.032 1.6 2.073 -0.2155 1 Stage 2 Local
500 1615 -1.032 9.055 0.3214 Stage 2 Search
600 1715 -1.032 -0.7299 -0.7686 Stage 2 Search
700 1815 -1.032 0.3191 -0.7431 Stage 2 Search
800 1915 -1.032 296.4 0.4577 Stage 2 Search
900 2015 -1.032 10.68 0.5116 Stage 2 Search
1000 2115 -1.032 -0.9207 -0.9254 Stage 2 Search
GlobalSearch stopped because it analyzed all the trial points.
All 3 local solver runs converged with a positive local solver exit flag.运行相同示例，但不进行 GlobalSearch 迭代显示，但进行 fmincon 迭代显示：
gs.Display = 'final'; problem.options.Display = 'iter'; [xming,fming,flagg,outptg,manyminsg] = run(gs,problem);
First-order Norm of
Iter F-count f(x) Feasibility optimality step
0 3 -1.980435e-02 0.000e+00 1.996e+00
1 9 -6.970985e-02 0.000e+00 3.140e+00 2.533e-01
2 13 -8.662720e-02 0.000e+00 2.775e+00 1.229e-01
3 18 -1.176972e-01 0.000e+00 1.629e+00 1.811e-01
4 21 -2.132377e-01 0.000e+00 2.097e-01 8.636e-02
5 24 -2.153982e-01 0.000e+00 7.701e-02 1.504e-02
6 27 -2.154521e-01 0.000e+00 1.547e-02 1.734e-03
7 30 -2.154637e-01 0.000e+00 1.222e-03 1.039e-03
8 33 -2.154638e-01 0.000e+00 1.543e-04 8.413e-05
9 36 -2.154638e-01 0.000e+00 1.543e-06 6.610e-06
10 39 -2.154638e-01 0.000e+00 1.686e-07 7.751e-08
Local minimum found that satisfies the constraints.
Optimization completed because the objective function is non-decreasing in
feasible directions, to within the selected value of the function tolerance,
and constraints were satisfied to within the selected value of the constraint tolerance.
First-order Norm of
Iter F-count f(x) Feasibility optimality step
0 3 -1.980435e-02 0.000e+00 1.996e+00
... MANY ITERATIONS DELETED ...
8 33 -1.031628e+00 0.000e+00 8.742e-07 2.287e-07
Local minimum found that satisfies the constraints.
Optimization completed because the objective function is non-decreasing in
feasible directions, to within the selected value of the function tolerance,
and constraints were satisfied to within the selected value of the constraint tolerance.
<stopping criteria details>
GlobalSearch stopped because it analyzed all the trial points.
All 4 local solver runs converged with a positive local solver exit flag.设置 GlobalSearch 迭代显示以及 fmincon 迭代显示会导致两种显示混合在一起。
有关并行环境中迭代显示的示例，请参阅 并行 MultiStart。
