MATLAB: How to find repeat element of vector

loopmatrixrepeat

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 ??

Best Answer

 for i=1  
  a=b(1:3:end);
 end

Related Solutions

MATLAB: How to repeat indivisual element of a matrix

for i=1:length(a)

b(3*i-2:3*i)=a(i);

end

MATLAB: Find out the rows having same values in all columns of a matrix

Something like this should get you started:

>> A = [0,0,0,0,1,0,0;1,0,0,0,0,1,0;1,0,0,0,0,1,0;0,1,0,1,0,1,0;1,0,0,0,0,1,0;0,0,0,0,0,0,0;1,0,0,0,0,1,0;1,1,1,1,1,1,1;1,0,0,0,0,1,0;0,0,1,1,0,1,0;1,0,0,0,0,1,0;0,0,0,0,1,0,0]
A =
   0   0   0   0   1   0   0
   1   0   0   0   0   1   0
   1   0   0   0   0   1   0
   0   1   0   1   0   1   0
   1   0   0   0   0   1   0
   0   0   0   0   0   0   0
   1   0   0   0   0   1   0
   1   1   1   1   1   1   1
   1   0   0   0   0   1   0
   0   0   1   1   0   1   0
   1   0   0   0   0   1   0
   0   0   0   0   1   0   0
>> [U,~,idx] = unique(A,'rows');
>> cnt = histc(idx,unique(idx)) % count how many times rows occur.
cnt =
   1
   2
   1
   1
   6
   1
>> out = U(cnt==6,:) % pick which the unique rows which occur >= 6 times.
out =
   1   0   0   0   0   1   0

If you want to get those multiple row instances, then try this:

>> idr = ismember(idx,find(cnt==6));
>> A(idr,:)
ans =
   1   0   0   0   0   1   0
   1   0   0   0   0   1   0
   1   0   0   0   0   1   0
   1   0   0   0   0   1   0
   1   0   0   0   0   1   0
   1   0   0   0   0   1   0

Best Answer

Related Solutions

MATLAB: How to repeat indivisual element of a matrix

MATLAB: Find out the rows having same values in all columns of a matrix

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