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

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?

Answer 1

[Image Analyst]

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

[Marina]

It worked!!!! Thank you very very much!!!!

Answer 2

[Youssef Khmou]

Here is the general case:

 A=round(rand(10));
for n=1:10
    for p=1:10

 if (A(n,p)==1)
A(n,p+1:end)=0;
end
end
end

Answer 3

[Azzi Abdelmalek]

a = [1 1 0; 1 1 1; 0 1 1]
b=zeros(size(a))
b(1,:)=a(1,:)

Answer 4

[Mischa Kim]

>> a = [1 1 0; 1 1 1; 0 1 1]

a =

       1     1     0
       1     1     1
       0     1     1

>> b = [a(:,1)>0 zeros(length(a(:,1)),length(a(1,:))-1)]

b =

       1     0     0
       1     0     0
       0     0     0