NN predictive controller - Internal S-function 'predopt', flag = 2 (update) problem

Hi there,

I'm encountering this problem for the first time, also i'm new to MATLAB & SIMULINK so please any help will be appreciated.

I'm trying to use NN to control the acceleration of a 1/2 car model, so that i used "NN predictive controller" block as shown and identified the NN plant. But when I run the si,ulation it gives this error:

• Error in 'untitled/NN Predictive Controller/S-Function' while executing MATLAB S-function 'predopt', flag = 2 (update), at time 0.0."
• Subscript indices must either be real positive integers or logicals.

Whatever i tried it just wouldn't work and I'm not understanding what should I do?

[Carolina Borges]

I am facing the same problem. I've already tried re-train the network, changed controlled parameters but nothing is working.

An error occurred while running the simulation and the simulation was terminated

Caused by:

• Error in 'testeagain/NN Predictive Controller/S-Function' while executing MATLAB S-function 'predopt', flag = 2 (update), at time 0.0.
• Array indices must be positive integers or logical values.

[Yash Raghuwanshi]

change delay to 2

[Ahmed EL-Ebiary]

which delay please as i face the same problem

Answer 1

[Jake Rankin]

I fixed my error after going back over some documentation

http://www2.cs.siu.edu/~rahimi/cs437/slides/nnet.pdf

And the variable that altered it for me was No. Delayed Plant Input. Mine never worked if it was 1 so I changed it to 2.

I also used the training function trainbr when training my parameters.

Sorry it's not a technical answer, but that's what helped me :)