How to identify and remove element if it is consecutively repeated a certain amount of times in an array

Question

Shuo Zhang 2019-8-7

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https://ww2.mathworks.cn/matlabcentral/answers/475183-how-to-identify-and-remove-element-if-it-is-consecutively-repeated-a-certain-amount-of-times-in-an-a

回答： Alex Mcaulley 2019-8-7

Hi,

I'd like to remove duplicates in an array only when it is consecutively repeated for a certain amount of time.

For example, say I have an array A=[1 2 3 3 3 3 5 6 2 8 7 3 3 2]; I'd like to identify and remove any element that is consequtively repeated for 3 times and more.

Specifically, I mean to identify and remove the 4 threes at A(3),A(4),A(5),A(6); While for the 2 threes at A(12), A(13), and the 3 twos at A(2),A(9),A(14), I'd like to keep them because either they are repeated but not consequtively, or not for 3 times and more.

I've searched how to remove duplicates, but it doesn't seem very helpful.

Is there any good solution to it?

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KALYAN ACHARJYA 2019-8-7

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Answer 1

Alex Mcaulley 2019-8-7

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https://ww2.mathworks.cn/matlabcentral/answers/475183-how-to-identify-and-remove-element-if-it-is-consecutively-repeated-a-certain-amount-of-times-in-an-a#answer_386529

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Following Jan's answer in this threat (link):

A = [1 2 3 3 3 3 5 6 2 8 7 3 3 2];
d = [true, diff(A) ~= 0, true]; 
n = diff(find(d));          
Y = repelem(n, n)
A = A(Y < 3)
A =
     1     2     5     6     2     8     7     3     3     2