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Discrete to continuous- Problem with signal dimensions

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Javier Guiterrez
Javier Guiterrez on 23 Feb 2012
Hello:
I had a system being simulated as discrete. Now I have changed every discrete operator (derivatives, integrals and so on) to continuous ones but some error have appeared with no clue to solve:
Error in port widths or dimensions. Invalid dimension has been specified for output port 2 of ....
Some blocks have the dimension of the input signals ok but it reaches a point in the diagram where some question marks appear as it does not recognize it. I have not changed anything except discrete operators.
Could the memory blocks be the problem?
Thank you in advance
  3 Comments
Kaustubha Govind
Kaustubha Govind on 24 Feb 2012
What is the second output of the block connected to? Perhaps that block (or one of its downstream blocks) is telling the Demux block that it needs a signal size that is not possible. Simulink determines this by performing back-propagation.

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Answers (1)

Kaustubha Govind
Kaustubha Govind on 24 Feb 2012
I would recommend replacing the connection to the block connected to the second output of the Demux block with something like an Inport block. Then turn on Format>Port/Signal Displays>Signal Dimensions, and update your model (Ctrl+D) - see what dimensions the downstream blocks are expecting. Does this signal dimension make sense as an output of the Demux block?

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