MATLAB Answers

Objective function doesn't converge but jumps around

1 view (last 30 days)
Matthew Hunt
Matthew Hunt on 2 Mar 2020
Commented: Matthew Hunt on 2 Mar 2020
I have been trying to complete an optimisation problem. I am looking at radial heat diffusion on a cylinder. I want to tackle it as an inverse problem in order to obtain values for heat diffusion and the like. I have an objective function Boundary_temperature which spits out the difference between the simulated data(computed by Battery_temp) and the measured data(contained in synth_temp).
The value of the objective function is just the l^2 norm of the calculated data and measured data, so a good value of the parameters should yield a small value. I set up the problem and the value of the objective function jumped about and didn't converge but jumped around, I even managed to obtain a warning of the matrix is singular warning which I don't understand.
I added in a stopping criterion, TolFun, which I set to 10^-3, and I hoped that would make things better, as I know that the value of the objective function did get that small, so I hoped that it would work quite nicely, I was wrong.
The equation in question is:
, ,
The variables I am trying to find is .
  2 Comments
Matthew Hunt
Matthew Hunt on 2 Mar 2020
I've added in some equations to make things clear.

Sign in to comment.

Answers (0)

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!