How does Simulink Selector block work to extract dimension MxN matrix into 1xN row vectors?

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Recently I was trying to take a 2x5 matrix signal and convert it into two 1x5 row vectors for further computation. To do so, I used the Simulink Selector block, and selected a 2 dimensional input (M of my MxN). Then to try and get just a row vector for dimension 1 and 2 respectively, I selected the Starting Index Option, and made sure that dimensional values were consistent (see image):
This setup works for the first row vector, but fails for the second row vector claiming the following error:
I eventually figured out how to split them into row vectors correctly via the following setup:
I am curious why the first setup works for the first row, but fails for the second row. Is this a bug, or do I have a fundamental misunderstanding of how this selector block is functioning? It seems odd that it would work in an inconsistent manner.
Jake Gonzalez
Jake Gonzalez on 25 Sep 2018
Aha! Based on this information, I made an edit to the input parameters and got the result I wanted.
Very Interesting. Thanks!

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Accepted Answer

Fangjun Jiang
Fangjun Jiang on 24 Sep 2018
Are you sure? I tried as your example and there is no error. The error happened in "Selector1" yet the dialog show "Selector2" and "Selector3".
Fangjun Jiang
Fangjun Jiang on 24 Sep 2018
The problem lies in the second dimension. The input is 2x5, so for the second dimension, if you starts with 2 but the output size is 5, then it requires 2x6 input. If you change the size from 5 to 4, then the error disappears.

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