Find unique values in a sequence containing at least 3 elements

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Adrian 2015-1-22

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https://ww2.mathworks.cn/matlabcentral/answers/171141-find-unique-values-in-a-sequence-containing-at-least-3-elements

评论： Adrian 2015-1-22

I want to find the unique values for each sequence containing minimum 3 repeating elements in a vector. For example, consider the vector:

x = [1 2 2 3 4 4 4 5 6 6 6 6 7 7 7 8];

The output (unique values) should be:

y = [4 6 7];

How can I achieve this?

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采纳的回答

Niels 2015-1-22

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https://ww2.mathworks.cn/matlabcentral/answers/171141-find-unique-values-in-a-sequence-containing-at-least-3-elements#answer_165587

在 MATLAB Online 中打开

u = unique(x);
a = histc(x,u);
y = u(a>=3);

This should do the trick. First determine the unique values in the vector, then count the number of times they occur. Then consider only the values that occur more than 2 times.

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Adrian 2015-1-22

Thank you very much. It works.

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