How to find repeat element of vector?

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Saiem Solimullah 2018-5-13

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https://ww2.mathworks.cn/matlabcentral/answers/400524-how-to-find-repeat-element-of-vector

编辑： Matt J 2018-5-13

Suppose, i have a matrix b=[1 1 1 0 0 0 1 1 1 1 1 1 0 0 0 0 0 0 1 1 1 1 1 1] and i want to find the repeated element of this matrix by 3 times using for loop . as the new matrix will be a=[1 0 1 1 0 0 1 1] . How easily can solve using for loop ??

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Matt J 2018-5-13

Why using a for loop?

Image Analyst 2018-5-13

what is the repeated element? 1, which is repeated many times. 0, which is repeated many times? 11, which is repeated many times? 00 which is repeated many times. 1 1 1 1 1 1 which is repeated twice? And so on. Or is it just the first elements before a zero occurs, 111, which will occur 9 times? Please explain. Also explain what "by 3 times" means because I have no idea. Do you want to find the repeated element location three times instead of just once for some unexplained reason?

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