Plot function variables for each iteration in fmincon

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Suvrat Ramasubramanian
评论： Xingwang Yong 2021-4-8
Hi,
I am trying to plot the variables values calculated for each iteration in fmincon. @optimplotx give histogram plot but i want to plot separately each variable for my function. I am able to plot for each function evaluation, but i want the variable values to be plotted for each iteration just like @optimplotfcn.

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采纳的回答

Matt J
Matt J 2017-9-23
编辑：Matt J 2017-9-24
You can specify your own custom PlotFcn. You don't have to use one of the pre-written choices like, @optimplotx.
function stop = myplotfun(x, optimValues, state)
persistent data
if ~nargin % example reset mechanism
data=[];
end
if strcmp(state,'iter')
data=[data,x(:)];
plot(data.');
end
stop=0;
end
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Matt J
Matt J 2017-9-25
编辑：Matt J 2017-9-25
PlotFcns is indeed the more natural thing to use. No idea why it doesn't work.
Xingwang Yong
Xingwang Yong 2021-4-8
It seems the reset mechanism above is made wrong on purpose. For completeness, this is one that works
function stop = myplotfun(x, optimValues, state)
persistent data
if strcmp(state,'init') % example reset mechanism
data=[];
end
if strcmp(state,'iter')
data=[data,x(:)];
plot(data.');
end
stop=0;
end

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