display parameter values at each iteration in the optimization

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Mona
Mona am 6 Feb. 2012
Bearbeitet: John Kelly am 2 Mär. 2015
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
  1 Kommentar
Sheng Liu
Sheng Liu am 6 Mär. 2012
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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Walter Roberson
Walter Roberson am 7 Feb. 2012
Bearbeitet: John Kelly am 2 Mär. 2015
Use an OutputFcn in the options structure.

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Sheng Liu
Sheng Liu am 6 Mär. 2012
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
wish it helpful for you!

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