Optim and differential equations?

[ChrisRackauckas]

@BLI

What puzzles me, is that Fminbox() suggests a minimum ≈0.76\approx 0.76, which is relatively far from the observed minimum around 0.60.6 observed in the plot.

What do I do wrong?

Using a local minimizer like L-BFGS usually isn’t a good strategy for this kind of problem. Give a global method like the ones from BlackBoxOptim.jl a try.