opti.solve() stuck/ maximum iterations exceeded

[Alessandro Maria Laspina]

Hello Joris, 

I have rewritten my system completely as an inline function of x and u from the previous question in Using tabulated data for nonlinear MPC using MATLAB (google.com). Previously, I had mentioned that the solver was throwing a NaN, but for some reason now it gets stuck at opti.solve() for several minutes only to return this error:

Error using casadi.Opti/solve (line 253)

Error in Opti::solve [OptiNode] at

.../casadi/core/optistack.cpp:159:

.../casadi/core/optistack_internal.cpp:999: Assertion

"return_success(accept_limit)" failed:

Solver failed. You may use opti.debug.value to

investigate the latest values of variables.

return_status is 'Maximum_Iterations_Exceeded'

The following formulation uses no parameters- I wrote the entire system using symbolics in another script then copied and pasted the result after I replaced the names of each variable with its corresponding place in the x or u array, where x are the state variables and u are the control variables. 

I can tell that the maximum number of iterations exceeded- is this on Casadi's side or ipopt? And if so, what is causing this issue and how can I obtain the outputs of each iteration step given by ipopt?

Thanks, 

Alessandro Laspina. 

[siddhartha ganguly]

Yeah, I'm facing the same problem solving a trajectory optimization problem as well. After reaching the limit of 3000 iteration MATLAB shows, maximum iterations reached. How to increase that count on max iter? 

[John Biscanti]

If you check out my code on the previous post it should help you.