Invalid dimension specified for input port.

I am attempting to extend one of the example 2D Kalman filter Simulink models to 3D, but am receiving the following error:
Invalid dimension specified for input port.
Please advise.

Answers (1)

Fangjun Jiang
Fangjun Jiang on 7 Jan 2026
Edited: Fangjun Jiang on 7 Jan 2026
Change the gain parameter of the feedback Gain block. Make it 3 values or 1 value.

3 Comments

Thank you for this answer. I increased the Gain block to 3 values. PSA new error related to the XY velocity block.
Different model, different cause.
In this model, every where it is expecting the size of 2 (x y acceleration, velocity, position). What is the point of changing one of the input port to be size of 3 ???
Thank you for this answer. I have made a modification to the XY acceleration model to accept 3 inputs and thus widen the bus length to 3. PSA a screenshot of a new error resulting from the modification.

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R2021a

Asked:

on 7 Jan 2026

Edited:

on 8 Jan 2026

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