display parameter values at each iteration in the optimization

Question

Mona 2012-2-6

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https://ww2.mathworks.cn/matlabcentral/answers/28258-display-parameter-values-at-each-iteration-in-the-optimization

编辑： John Kelly 2015-3-2

Hello all,

I use "fminsearch" for optimization. I want to display or save the parameter values (x values) at each iteration. Setting 'display' 'iter' in the options only shows the function values. I was wondering how can I display or save the x values at each iteration?

I appreciate your help.

Best, Mona

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Sheng Liu 2012-3-6

hi，I think we have the same problem in the filed of optimization in current study,shall we change our MSN to communicate freely and quickly?

My ID:

disini@live.cn

thank you

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Answer 1

Walter Roberson 2012-2-7

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编辑：John Kelly 2015-3-2

Use an OutputFcn in the options structure.

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Mona 2012-2-7

Thank you.

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Answer 2

Sheng Liu 2012-3-6

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https://ww2.mathworks.cn/matlabcentral/answers/28258-display-parameter-values-at-each-iteration-in-the-optimization#answer_39791

在 MATLAB Online 中打开

I rewrite the example in the help page of outputFcn,like this:

function [x fval] = myproblem1(x0) options = optimset('OutputFcn', @myoutput,'Display','iter'); 
[x fval] = fminsearch(@objfun, x0,options); 
function stop = myoutput(x,~,state) 
stop = false; 
if state == 'iter' 
disp([' x = ',num2str(x)]); 
end 
end 
function z = objfun(x) 
z = exp(x(1))*(4*x(1)^2+2*x(2)^2+x(1)*x(2)+2*x(2)); 
end 
end