Hi all,
I am using several optimizers from nlopt in Python. I sometimes encounter an unexpected result when using the COBYLA optimizer.

I am trying to minimize a function subject to a non-linear constraint. I give the optimizer a startpoint that satisfies the constraint. COBYLA however returns output that does not satisfy the constraint, while reporting that the optimization finished successfully. This is not what I expect to happen and I cannot use the result.

Can someone please enlighten me on this issue? I added the code below. Thanks!

example_code_cobyla.txt