NARX export to Simulink time step

Hello,

I want to export my trained model to Simulink using MATLAB's "Export to Simulink " option. I have a problem exporting the NARX network with the time constant. My simulation step size is 0.001, but the trained NARX network block overlooks the step size and uses 1 second as the step size visible in the picture.

I didn't experience this when I worked with MLP networks. How can I adjust the step size when exporting the block?

Thank you

Answer 1

[Tejas]

Hello Sohrab,

When exporting a NARX network block to Simulink, the ‘gensim’ function can be used to adjust the sample time as needed. There are two ways to do this:

• By directly specifying the sample time by providing the network as the first input and the sample time as the second input.

    gensim(net, 0.001); 

• Using name-value pair to specify the sample time, especially when dealing with multiple inputs, as demonstrated in the example below.

    [sysName,netName] = gensim(net,'SampleTime',0.001,'InputMode','Workspace',... 
        'OutputMode','Workspace','SolverMode','Discrete'); 

The following documentation can be referred to get more information on ‘gensim’ function: https://www.mathworks.com/help/releases/R2022b/deeplearning/ref/network.gensim.html .