# How to find repeat element of vector?

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Saiem Solimullah on 13 May 2018
Edited: Matt J on 13 May 2018
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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Image Analyst on 13 May 2018
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?

Matt J on 13 May 2018
Edited: Matt J on 13 May 2018
for i=1
a=b(1:3:end);
end