MATLAB: Check to find if a row has an element occuring more than once

element occurring more than a specified numberMATLAB

I need to find if a row has more than one occurence of 1s. I am expecting a response return like true or false. Sample row matrix is below:

0 0 1 1 0 0

Best Answer

A = [0 0 1 1 0 0; 0 0 0 0 0 1; 1 1 0 0 0 1]
res = (sum(A==1,2)>1)

This works row-wise for more than 1 rows

Related Solutions

MATLAB: How to extract the events which have more than 3 consecutive rows

r=3; how many repeats
mask = idx3.' == 2;  %row
starts = strfind([false mask], [0 ones(1,r)];
stops = strfind([mask, false], [ones(1,r) 0]) + r-1;

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 extract the events which have more than 3 consecutive rows

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

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