How to have variable-sized output for Simulink MATLAB-function block?

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Arun 2013-7-22

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I have a MATLAB function-block in Simulink and I would like to have the output port of the block dynamically sized based on an input parameter. Eg:

function[y] = MATLABblock(u, s)
      y = someCalc(u,s) %%Returns array of size s %%

Is this possible?

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Answer 1

Kaustubha Govind 2013-7-22

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I think this should work as long as you can enforce a maximum size for y. Simulink currently does not support dynamic memory allocation, so you must specify a maximum-size for variable-size signals. Please see the section on Variable-Size Data in the documentation to ensure that your output is configured as variable-size.

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Arun 2013-7-23

Hi! Thank you for your response. I have got it to work. However, is there a restriction on how many such ports in a block can be variable-sized? The reason is, I have 8 identical ports with identical Port Settings (variable size with an upper bound of 1024), but only one of them works.

Arun 2013-7-23