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What are "gap ports" in Simulink?

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Zachary
Zachary on 20 Jan 2020
Commented: Zachary on 27 Jan 2020
I am trying to convert a Subsystem to a Subsystem Reference, but I get this error message. What are "gap ports"? I can't find any mention of it on MATLAB Documentation or MATLAB Answers.
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Accepted Answer

Payas Bahade
Payas Bahade on 24 Jan 2020
Hi Zachary,
This is a known issue and the error is due to the number of port handles and the number of port blocks inside the Subsystem being unequal.
To get rid of the error, both port handles and port blocks have to be equal in number.
Hope this helps!

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Zachary
Zachary on 27 Jan 2020
In the end, I was unable find the mismatch between port handles and number of port blocks. Instead of using the toolstrip UI conversion, I manually copied the contents into a new Blank Subsystem, saved the file, and configured a new Subsystem Reference block to point to this new file.
If this post is viewed by others, I might have been able to troubleshoot by reading the block's 'PortHandles' and 'Ports' properties...
port_handles = get_param(gcb,'PortHandles')
ports = get_param(gcb,'Ports')
...and altering the incorrect values with set_param, but I didn't try this so no promises.

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