Using neural network in function block from Simulink

My Simulink workspace looks like this:

and the function contains just a few lines:

function y = mysimulinkfunction(u,v)
%#codegen

global net;
y = net([u;v]);

The object "net" is an already trained feed forward network residing in my workspace which can be successfully called from the command line via

net([1;0])

and writes the correct answer (which is 1.0).

However Simulink throws several errors when I try to run it, first:

Global declaration not resolved to a Data Store Memory block registered via the Ports and Data Manager.

and 2nd:

Could not find initial value for global variable 'net'.

Those errors sound like it is not possible to call neural networks that way, however I just want to know if there's another possibility than gensim(net) to use a NN in Simulink.

Answer 1

[Ryan Livingston]

In the MATLAB Function Block global variables are linked to Data Store Memory blocks rather than the MATLAB workspace:

http://www.mathworks.com/help/simulink/ug/using-global-data-with-the-matlab-function-block.html#bshotv6-1

However, I don't believe that Neural Network objects are directly supported for code generation.

The simplest alternative to gensim I've seen to utilize a trained NN in the MATLAB Function Block or MATLAB Coder is genFunction:

http://www.mathworks.com/help/nnet/ref/genfunction.html

That page describes how to create a MATLAB Function Block/MATLAB Coder compliant MATLAB function via the syntax:

genFunction(___,'MatrixOnly','yes')

This will produce a MATLAB function which you should simply be able to call from inside your MATLAB Function Block to simulate the NN.

[Zeljko Tomicevic]

Thanks

Answer 2

[Simon Christmann]

Here is the full solution for Zeljko Tomicevic and anyone who found this thread on Google

Answer 3

[XIN HE]

Did you got it fixed? I got the similar proble, could you share your solution ?

Answer 4

[michael bronnmann]

Hey, is there any way to use "SeriesNetwork" in Simulink?

[yassine kebbati]

were you able to find a way to do that?

[michael bronnmann]

Not yet. It seems up to now, there is no (simple) way...

Answer 5

[Asma A Bder Muhmed]

How I can put these numeres in equation?