MATLAB: How to exclude an index from generating a random number

for looprandom number

Hello,

I want to generate a matrix that has in every row one element set to one. However, the numbers on the diagonals should not be one.

This is the code I have now. However, j can not be equal to i, but I don't know how to exclude i from generating j.

W = zeros(N,N);

for i = 1:N

j = randi(N);

W(i, j) = 1;

end

I hope someone can help! Thanks in advance 🙂

Best Answer

W = zeros(N,N);                   for ii = 1:N 
      for jj = 1:N
          if ii ~= jj
              Hj = randi(N);
              W(ii, jj) = 1;
          end 
      end
  end

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MATLAB: How can i simplify this expression

Hi Dror,

n1 = 10;  % in case the dimensions are not all the same
n2 = 6;
n3 = 33;
n4 = 28;
u = rand(n1,n2,n3,n4) + i*rand(n1,n2,n3,n4);
h = rand(n3,n4) + i*rand(n3,n4);
res = zeros(n1,n2,n3,n4);
for ii = 1:n3    % I don't use i as a sum variable so i can stay as sqrt(-1) 
    for j = 1:n4
        res(:,:,ii,j)=h(ii,j)*u(:,:,ii,j);
    end
end
res = sum(res,[3 4])
% different way
uu = reshape(u,n1*n2,n3*n4);
hh = reshape(h,n3*n4,1);
res1 = reshape(uu*hh,n1,n2)     % same thing

MATLAB: How to store index values in the form of arrays using for loop

rng default
M = zeros(randi([3 6]),randi([3 6]))
[u,v] = size(M)
inc  =1;
for i = 1:u
    for j = 1:v
       indices(inc,:) = [i ,j];
       inc = inc+1;
    end
end

or you can use to ind2sub instead of for loop


[x,y]=ind2sub(size(M),1:numel(M));
indices = [y' x'];

Best Answer

Related Solutions

MATLAB: How can i simplify this expression

MATLAB: How to store index values in the form of arrays using for loop

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