operspec error: the simulation inputs must be specified as a vector of doubles

Hello,

I am currently trying to build a MPC simulink model following https://www.mathworks.com/help/mpc/ug/adaptive-mpc-control-of-nonlinear-chemical-reactor-using-successive-linearization.html, which relies on the "operspec" function.

I have encountered an error which says that " the simulation inputs must be specified as a vector of doubles" (See attached screen shots)

However, I have ensured that all the input to "operspec" are doubles. (see attached)

Does anyone know how I can resolve this problem?

The full model can be found on Github: https://github.com/christeefy/ECOstudioMPC, the offending file is AdaptiveInitBuilding.m

Thanks and god bless

Answer 1

[Mingkai Wang]

Hi Bolin,

Sorry the previous explanation is not the reason. I found a "divided-by-zero" bug in my model, which hurts the calculation. The structure variable in the lookup table always gets a warning - It's actually innocent in terms of the calculation. Good luck!

Best

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I had the same problem. I finally got my model running by removing the structure variable in the model's lookup table block. I think this kind of variables cause trouble when calculating the derivatives during the trim or operation-point-finding. Maybe this could help.

Best