How can I highlight the direct feedthrough paths in Simulink?

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MathWorks Support Team am 27 Jun. 2009

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Akzeptierte Antwort: MathWorks Support Team

I am using the "sizes" option from the command-line to determine if my model contains any direct feedthrough. For example, if my model is named mymodel.mdl, the "sizes" option can be accessed by typing:

[sys,x0,str,ts] = mymodel([],[],[],'sizes');

The output "sys" includes a flag which shows whether or not the model has a direct feedthrough path. I would like to be able to find out which blocks are involved in any direct feedthrough paths, with a graphical display which highlights the blocks.

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Answer 1

MathWorks Support Team am 27 Jun. 2009

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find_feedthrough.m

The ability to highlight direct feedthrough paths is not available in Simulink.

To work around this issue do the following:

1. Download the attached script find_feedthrough.m

2. Select the subsystem and run find_feedthrough.m:

find_feedthrough(gcb)

The MATLAB file will print a list of the ports that have a direct feedthrough inside the subsystem.

It sets the option “Algebraic Loop” in "Configuration Parameters -> Diagnostics" to Error. It connects all pairs of input and output ports, simulates the model and checks if there is an error. If there is an error, it assumes that there has been a direct feedthrough between the two ports.