MATLAB: Can anyone help me to search for ones in the rows of a matrix and replace the remaining ones with zeros

loopsreplacerow

Hi!
I am quite new in Matlab. I have a a matrix with ones and zeros, for ex a = [1 1 0; 1 1 1; 0 1 1]. I want to get a new matrix with ones only in the first position it occured in A ROW, and replace all the other ones in THE ROW with zeros. So there should be only one number 1 in the row, or not at all. I have tried this a while and for loop combination, but it didn't seem to work. Any ideas?

Best Answer

Do you mean like this:
a = [1 1 0; 1 1 1; 0 1 1]
b=zeros(size(a)); % Initialize.
for row = 1 : size(a, 1)
  first1 = find(a(row,:), 1, 'first');
  b(row, first1) = 1; % Set column of the first 1 in the row.
end
b % print to command window
a =
     1     1     0
     1     1     1
     0     1     1
b =
     1     0     0
     1     0     0
     0     1     0
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