Unique function doesn't work in Simulink

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Andrew Poissant 2017-9-22

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https://ww2.mathworks.cn/matlabcentral/answers/357957-unique-function-doesn-t-work-in-simulink

评论： Andrew Poissant 2017-9-25

I have a 624x2 matrix that needs to have repeated ordered pairs removed. The first column represents x values and the 2nd column represents y values. There are some repeating pairs and I need to remove them in the matlab function block in Simulink but when I execute the "unique" function in Simulink I get an error saying: An error occurred while running the simulation and the simulation was terminated Caused by: The second operand is not sorted in ascending order. Use SORT first.

How do I get around this error? If I use "sort" then won't I lose my ordered pairs because the two columns will be sorted independently? My highly simplified code is below.

SRM = some 624x2 matrix SRM = unique(SRM(:,:), 'rows');

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OCDER 2017-9-22

That's odd, since unique(SRM, 'rows') should remove duplicate rows and sort for you.

If you need to sort by rows, use sortrows .

Andrew Poissant 2017-9-25

Sortrows works well but for some reason simulink is still giving the same error even when I sort by rows. It seems like a really rigid addition to matlab. Any idea how to remove repeated rows without unique?

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Answer 1

Brian Hannan 2017-9-25

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https://ww2.mathworks.cn/matlabcentral/answers/357957-unique-function-doesn-t-work-in-simulink#answer_283018

You can use the 'stable' setOrder argument to get around this.

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Andrew Poissant 2017-9-25

I tried this, but am still getting the same error requesting that I use SORT first. I am getting an error using the following line: SRM = unique(SRM(:,1:2), 'rows', 'stable');

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