Rebeccakaur asked . 2020-07-28

how to find the element which is greater than or equal to its row and smaller or equal to its column in a matrix

function indices = saddle(M)
[ rows,cols ] = size(M);
[valR,posR] = max(M,[],2);
[valC,posC] = min(M,[],1);
indices= [];
for i = 1:length(posR)
    if i == posC(posR(i))
        indices= [indices; i, posR(i)];
    end
end
end

It is running fine. But when i test my code for

>> mat=zeros(5,3)

mat =

       0     0     0
       0     0     0
       0     0     0
       0     0     0
       0     0     0
I am getting wrong output :

saddle(mat)

ans =

       1     1

the correct output must be

saddle(mat)
ans =
     1     1
     2     1
     3     1
     4     1
     5     1
     1     2
     2     2
     3     2
     4     2
     5     2
     1     3
     2     3
     3     3
     4     3
     5     3

What i am doing wrong??

matrix , matlab