Warnings for Non-existent Ports in a Matlab Function Block

Hi all

I have a rather large model in Simulink. When it runs, it gives me a number of warnings similar to the following one:

Warning: Block 'SS_SplitSimulink_Model1/MATLAB I1/ SFunction ' output 'Inf'
for element 23 of output port 2 at minor time step 0.00016552

The strange thing is that the "MATLAB I1" block has only one output port. Is there any way in which a Matlab function block can have something like hidden ports? I get 'Inf" and "NaN" warnings, which is obviously quite troubling...

I apologise if I'm not giving enough info.

Answer 1

[Niklas Nylén]

If the S-function was generated in Real time workshop/Simulink coder you can right click MATLAB I1 and select Look under mask. You should be able to see another "layer" where more outputs may exist.

[Niel]

Thank you for the reply.

Unfortunately, the "mask" option is not available. Any other possibilities? The model runs well, making the warnings all the more confusing...

[Niklas Nylén]

Possibly outport 2 inside the S-function is only used for internal feedback and that is why there is no second outport on 'MATLAB I1'. As far as I know it is not possible to look inside an S-function unless you have access to the source code.

[Niel]

Thank you, Niklas. It sounds good. If you get another idea in time, feel free to share =)