[Bug] Auto-differencing error on J2 perturbation in an orbit transfert OCP

[Albert-1stein]

Auto-Differencing error: Cannot determine ordering of Dual tags ForwardDiff.Tag{ReverseDiff...

To Reproduce
Launch main.jl
This is caused by the section #J2 in the function f0 in dynamics.jl (commenting this section leads to a correct OCP resolution).

debug.zip

[abavoil]

cc @jbcaillau

[jbcaillau]

hi @Albert-1stein ; the problem is due to AD in Julia an documented here:
#481 (comment)

try to play with AD backend options: check https://control-toolbox.org/Tutorials.jl/stable/tutorial-discretisation.html#Large-problems-and-AD-backend

[ocots]

Or maybe use :exa with :madnlp?

See https://control-toolbox.org/OptimalControl.jl/stable/manual-solve.html#Choosing-a-method.

[jbcaillau]

Or maybe use :exa with :madnlp?

See https://control-toolbox.org/OptimalControl.jl/stable/manual-solve.html#Choosing-a-method.

yes, @Albert-1stein to be tried also

[abavoil]

:generic is the most robust backend: uses only ForwardDiff.jl. No reverse-diff, no automatic sparsity detection. It is slow but it works in most cases, and if it doesn't the others probably won't aswell.