MATLAB: Matrix with at most one 1 per row

binarymatrix arrayone

Hi,

I want to create a binary 2D matrix with at most one '1' per row. This '1' should be at a random column in each row. Can anyone provide me help on this?

thank you in advance

Best Answer

A=zeros(4)
n=size(A,1)
idy=randperm(n)
idx=1:n
idxy=sub2ind(size(A),idx,idy)
A(idxy)=1

If the matrix is not square

A=zeros(7,5)
[n,m]=size(A);
idy=randi(m,1,n)
idx=1:n
idxy=sub2ind(size(A),idx,idy)
A(idxy)=1

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MATLAB: Shuffle n rows of a matrix

Try this

M = rand(5);
idx = [randperm(3) 4 5];
M_shuffled = M(idx, :)

MATLAB: Find the repetition of matrix rows

a = [1 2 3; 4 5 6;1 2 3; 3 2 4; 1 2 3; 3 2 1; 1 3 2] ;
row2check = 1;
repeated = 0 ;
for i = 1 : size(a,1)    
  repeated = repeated + prod(double([a(row2check,:)== a(i,:)])) ;
end
fprintf('\n Row number %i is reapeated %i times in matrix!\n\n',row2check,repeated);

Best Answer

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MATLAB: Shuffle n rows of a matrix

MATLAB: Find the repetition of matrix rows

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