in an assignment a(i) = b the number of elements in b and i must be the same

Hi, I have a problem in MATLAB. while finding the index of minimun number of each row of a matrix of size 150*3 and to make 3 groups of them based on their column no, I am facing a problem. My code is (z is the matrix)

k=0;
l=0;
m=0;
for i=1:150
  [r(i),c(i)]=find(z==min(min(z(i,:))))
  if c(i)==1
    k=k+1
  else
    if c(i)==2
      l=l+1
    else
      if c(i)==3
        m=m+1
      end
    end
  end
end

 after 9 rows, the error code shown is ""in an assignment a(i) = b the number of elements in b and i must be the same"". what should I do?

Answer 1

[dpb]

I didn't see the location for the assignment problem (and you didn't supply the line the error occurred on) but...

[~,c]=min(z,[],2);  % column of each row minimum in z
nbin=histc(c,1:size(z,2));  % counts for each column

Answer 2

[Adam]

Your code works fine for me when I create a random matrix of 150*3, but it seems to me that the following code would better achieve what you want and might solve your error at the same time:

[~, idx] = min( z, [], 2 );

k = sum( idx == 1 );
l = sum( idx == 2 );
m = sum( idx == 3 );