Create model with input of variable size

2026 7 7
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更新时间：2026 7 13
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Hello everyone,
I'm trying to create a simple model with a input that should be an array with size determined by a parameter that can be changed for any istance of the referenced model.
I have tried different things but I'm still not able to create it and i havent' found nothing similar into documentation.
Anyone has advice for this kind of problem.
Best regards.
Claudio

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John D'Errico
John D'Errico 2026-7-7
Be specific, not vague, at least if you want good help. There must be dozens of tools in MATLAB that can work with a "model" in some form, in as many ways. Explain what you are doing, far more clearly. Wha tool are you using? Is this a question about Simulink? Or perhaps a regression model of some form?
Claudio Rosso
Claudio Rosso 2026-7-7
I'm just using simulink, i have a block into my custom library that accept as input one array of boolean with size not defined by the blocks but only by the "user".
I want to create the same behaviour with a normal model instead of a library block
Walter Roberson
Walter Roberson 2026-7-7
@Claudio Rosso
How will the block accept the input? From Workspace? From File? Constant Block with parameter set() by a MATLAB script?
Claudio Rosso
Claudio Rosso 2026-7-8
The input in the model is an inport that must be filled by the root model who will reference it. The root model could connect to that input a constant, a parameter, or a root inport. The final scope is C code generation
Isha
Isha 2026-7-10，10:04
Hello,
Based on your description, a bounded variable-size signal seems like the right approach. Configure the referenced model Inport as variable-size and specify an upper bound. This allows the root model to provide arrays of different lengths while remaining compatible with C code generation. Unbounded variable-size signals are not supported for C code generation.
Documentation:
Hope this helps.
Claudio Rosso
Claudio Rosso 2026-7-13，10:15
Hello,
thank you for your answer.
I have tried the approach you adviced but i found this limitation: if i instance the model into another model and i want to fix the array size using an inport to that instance, Simulink ask me to use variable-size inport even if i would like in that case to fix it. The only way to have it fixed, seems to connect the input of the referenced models a constant.
Is there any way to use inpoirt with fixed size?

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Claudio Rosso
Claudio Rosso
2026-7-13，10:15

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