Ill-posed problem detected: LBG[0] <= UBG[0] was violated. Got LBG[0] = nan and UBG[0] = nan.

[parzival2]

Hi,

Great looking set of tools. When I am trying to run an example, I am getting an error from Casadi that says

RuntimeError: .../casadi/core/nlpsol.cpp:489: Assertion "lb <= ub && lb!=inf && ub!=-inf" failed: Ill-posed problem detected: LBG[0] <= UBG[0] was violated. Got LBG[0] = nan and UBG[0] = nan.

How can it be reproduced

• Install omg-tools
• Clone the example repository
• Run any example.

Versions of packages Casadi - 3.5.2 (Is it too recent?) It was installed automatically while installing omg-tools Update Casadi - 3.4.1 and 3.5.1 works. scipy - 1.2.3 omg-tools - 0.1.4

Can anybody let me what might be the problem that I have and how can it be solved?

Thanks.

[jgillis]

Which example?

[parzival2]

Sorry for not mentioning the example in the description. I have tried with multiple ones and all resulted in the same error. The examples I have tried so far are

• p2p_bicycle.py
• p2p_dubins.py
• platform_landing.py
• revolving_door.py

I will also try with a different version of Casadi and update the issue description.

Thanks for the reply.

Update The examples are working with 3.4.1 version of Casadi.

[jgillis]

And 3.5.1?

[parzival2]

Sorry for the delay. Just checked now. Casadi(3.5.1) works.

[jgillis]

Now fixed in CasADi 3.5.3