Calculate vector norm in Simulink?

Question

Joshua 2013-4-8

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https://ww2.mathworks.cn/matlabcentral/answers/71024-calculate-vector-norm-in-simulink

评论： Steven Crews 2021-4-21

采纳的回答： Jon

Is there a block that finds the norm of a vector in simulink? I haven't found the equivalent to norm(v) from MATLAB.

Thanks!

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Answer 1

Jon 2013-4-8

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You can use the dot product block (with the same vector wired to both inputs) followed by a square root. Both are under the Math Operations library. I think the previously suggested abs block computes the absolute values of each element of the input vector.

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Answer 2

Youssef Khmou 2013-4-8

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hi, it does exist, its called "abs" , open Simulink library and go to :"Math operations" block , its the first on the list, with notation u : ABS

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Jon 2013-4-8

As noted in my alternative answer, I don't this this gives you what you want. As far as I can tell abs gives the element wise absolute values, not the norm

Steven Crews 2021-4-21

Agreed. This is not the correct answer.

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Answer 3

Joshua 2013-4-8

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Thanks!

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Answer 4

Youssef Khmou 2013-4-8

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在 MATLAB Online 中打开

hi, if the first answer does not work, you can use other ways, like :

1) go to " User Defined Functions" in Simulink Block .

2) choose "f(u)" FCN, add it to your file , right click on it you will find the default value :

sin(u(1)*exp(2.3*(-u(2))))

change it to

"norm(u)"

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Jon 2013-4-9

I couldn't find and "Embeded function" Do you mean the Interpreted MATLAB Fcn under User Defined Functions? The Interpreted MATLAB Fcn works, but I would guess that the dot product block, followed by the sqrt block is faster, because it doesn't need to be interpreted.

Youssef Khmou 2013-4-9