MPPT Loop for problem

I'm using a function block to calculate the max power for a population of voltages and currents, so i'm using a for loop to calculate power for my current population and find the max power and the best voltage for it . My problem is find max power and best voltage and storing I and V as output vector.

for i= 1:n

          Ipv=I;
          Vpv=V;
          po=Vpv.*Ipv;
          p=max(po);
          if p>power
              power=p;                                      
              Vopt=V;                                       
          end
      end