Discrete to continuous- Problem with signal dimensions

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Javier Guiterrez
Javier Guiterrez 2012-2-23
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
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Javier Guiterrez
Javier Guiterrez 2012-2-24
It is a demux block that was working perfectly in previous simulations. It has 1 input signal and 4 output signals.
Kaustubha Govind
Kaustubha Govind 2012-2-24
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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Kaustubha Govind
Kaustubha Govind 2012-2-24
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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