Plotting x vector of fmincon

Dear All,

I am trying to plot the x value of fmincon to show how the transition phase reaches its optimum value.

I will get x(1),x(2),(3),..... x(6)

Each x starts at initial point and reaches to its upper bound or to its lower bound. I would like to plot all the six variables on a single plot to present the transition of all the variables for every iteration.

I tried plotfn with options = optiset('Display', 'iter') it provides bars of the optimum values of variables.

It would also helpful if someone could help me how to save x variables for every iterations, so that i can plot.

Any suggestions are much appreciated.

Thank you,

Best Regards, Sai

Answer 1

[Alan Weiss]

Use an output function to save the values of x. There is more detail here. There is an example of saving the history here (careful, this example uses a different syntax than fmincon, but the idea is the same).

Alan Weiss

MATLAB mathematical toolbox documentation

Answer 2

[Veeranki]

Dear Alan,

I tried both of them, but i couldn't get the x values for every iterations. I am presenting the plot that plotfn is providing for my report.

Thank you for your reply.

if there exists any good solution for it, i would appreciate anyone posting it.

Best Regards,