How to handle this loop?

I have a loop in my code as below

   for i=1:n-1
    k=1:sz1;
    temp=rand(1,sz1)
    if temp(1,:)<=0.6
    QAKAN1(i,k)=QAKAN11(:,k).*temp(:,k)
    QAKAN11=QAKAN11(:,k)-QAKAN1(i,k)
    end
end
QAKAN1

where 'n' and 'sz1' are integers. The problem is that if temp is greater than 0.6, it is executing the loop and returning the result as 0.

            0            0
       182.93       1789.8
            0            0
       249.72       682.57

Please help in solving the problem.

QAKAN11= 1125 3323