using fminsearch--how to realize the display of the x values in every step of iteration?Thank you!!!

We all know the Display option in the fminsearch function can show the procedure during the iterations.But there are only 4 columns of datas--Iteration , Func-count , min f(x) , Procedure. And I want to know how to make the current x values (the variable values) of the current iteration?

like this：

x =
      0.125007539673239    -0.532250280724846

rather than displaying the final result only.

But,how? Thanks a lot!

For saving your time,you can explain your methods with the example below,thank you!

The outfun function:

outfun.m：

function stop = outfun( x,optimValues,state )
 stop=false;
 hold on;
 plot(x(1),x(2),'*');
 drawnow
 end

the script which calls the outfun function： OutputFcn1.m：

options=optimset('OutputFcn',@outfun,'Display','iter','MaxIter',30)
 hold on
 objfun=@(x)exp(x(1))*(4*x(1)^2+2*x(2)^2+x(1)*x(2)+2*x(2))
 [x,fval,exitflag,output]=fminsearch(objfun,[-1,1],options)
 hold off

[Todd LeBlanc]

I would also like to know of an answer to this problem.

Answer 1

[Steven Lord]

See the examples in this page in the documentation.

You can write your OutputFcn to do whatever output logging or display you want. The first example on that documentation page plots the points at which fminsearch evaluated your function. The second assembles the list of points into a matrix named history. When you call the example function using three outputs the third output is the history function containing all the points at which fminsearch evaluated your function.

You could write an OutputFcn that displays the points on the screen using disp or fprintf.

You could write an OutputFcn that writes the data to disk using save or fprintf.

If you have a text-to-speech function, your OutputFcn could say the coordinates to you.

[Todd LeBlanc]

Thanks so much!!