how demux the Matrix 3*3 in simulink ?

how demux the Matrix 3*3 in simulink in matlab

Error:Invalid setting for dimensions of input port of 'inv/Demux'. The Demux cannot be used to split matrices

Error:Error in port widths or dimensions. 'Output Port 1' of 'inv/Constant2' is a [3x3] matrix.

[mohammad]

Does anyone know this?

[Avni Agrawal]

Hi, can you share the code file?

[mohammad]

matlab2023b

Answer 1

[Avni Agrawal]

Hi Mohammad,

I understand that you are trying to demux 3*3 matrix in Simulink. You cannot directly pass a 2D vector (matrix) as input to a Demultiplexer (Demux) block in Simulink. The Demux block is designed to work with 1D vectors, where it can separate the vector into its individual elements.

There are two ways to make this work:

Method 1: Using Reshape block

Method 2: Use Selector blocks to extract elements from a matrix. You will need to configure each Selector block to extract the appropriate element.

Here's how you can set up the Selector blocks to demux a 3x3 matrix:

1. Drag and drop 3 Selector blocks onto your Simulink model from the Simulink Library Browser under the Simulink > Signal Routing category.

2. Connect the input matrix to the input of each Selector block.

3.. For each Selector block, double-click to open its parameters and set the following:

- Number of input dimensions: Set this to `2` for a 2D matrix.

- Index mode: `One-based`

- Index Option: Select `Index vector (dialog)` for both dimensions.

- Index Vector (dialog): 1

- Index Vector (dialog): [1 2 3]

Repeat this process for each element, changing the indices accordingly.

This will create 3 selector blocks having 1D vector with each row data in selectors respectively.

You can now connect them via mux and then pass it to Demux.

I hope this helps.

[mohammad]

thanks

[mohammad]

If you have the method 2 simulation file, please send it, thank you

[Avni Agrawal]

Sure

[mohammad]

thanks

Answer 2

[Selena Mastrodonato]

You can use the Selector block for matrix. Here the documentation.

[mohammad]

thanks