Simulink subtraction of consecutive rows from a matrix

Question

Gazi Taspinar 2021-4-7

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https://ww2.mathworks.cn/matlabcentral/answers/795522-simulink-subtraction-of-consecutive-rows-from-a-matrix

回答： Michael Savitz 2021-8-6

Hello everybody,

I have a problem with substracting of consecutive rows from a matrix. I have a matrix R whose dimension is Nx3 where N is inputted by user. For example;

If N=2;

I have 2x3 matrix. My intention is to find R(2,3)-R(1,3).

I tried to use vector index inside a for loop but I got error about dimensions. I get following error.

My simulink model is as follows:

Could anyone help me please?

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Answer 1

Michael Savitz 2021-8-6

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Hi Gazi,

It appears that your model is using the Index Vector block to select rows of the matrix R. The Index Vector block does not support matrix inputs. See https://www.mathworks.com/help/simulink/slref/indexvector.html.

Instead, you may want to use the Selector block. See https://www.mathworks.com/help/simulink/slref/selector.html.

Hope this helps,

Michael