Show an expression on each iteration of the optimization

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Jurgen
Jurgen 2014-9-29
评论： Alan Weiss 2014-10-1
Hello,
I'm using "lsqnonlin" to optimize a function and would like to show a expression, important for my problem, in each iteration. This expression depends on the optimization variables, therefore will change with each iteration. I understand that I can do this with OutputFcn, but I failed to understand how. I think it should not be complicated, please help!
The indicator is: (z(1)*z(2)+6)/z(4)+z(5)*z(6)
Thanks in advance!

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Alan Weiss
Alan Weiss 2014-9-29
Write a function named Jurgenoutput consisting of the following:
function stop = Jurgenoutput(z,optimValues,state)
stop = false;
indicator = (z(1)*z(2)+6)/z(4)+z(5)*z(6);
disp(indicator)
Include the output function in your solver call as follows:
options = optimoptions('lsqnonlin','OutputFcn',@Jurgenoutput);
x = lsqnonlin(fun,x0,lb,ub,options)
Alan Weiss
MATLAB mathematical toolbox documentation
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Jurgen
Jurgen 2014-10-1
Apparently I can not use any variable defined outside the output function, I want to do the following and can not.
function stop = Jurgenoutput(z,optimValues,state)
stop = false;
indicator = (z(1)*z(2)+6)/z(4)+z(5)*z(6)*g1c;
disp(indicator)
where g1c was defined outside Jurgenoutput and is a constant number.
Alan Weiss
Alan Weiss 2014-10-1
You need to look at how to pass extra parameters. Probably, a nested function would pass g1c successfully.
Alan Weiss
MATLAB mathematical toolbox documentation

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