MATLAB: Using end value in next iteration

loopswhile

want the Vo at the end of each loop to be used in the start of the next iteration, just can't get to work, I display Vn but its not updating from iteration to iteration. Any thoughts?
    %





    Voo = [30 15 13 10];   %
    while true
    %
    Vo = Voo;
    %
    f1 = 64 / Re1;
    f2 = 64 / Re2;
    f3 = 64 / Re3;
    f4 = 64 / Re4;
    X = [matrix]
    %
    Y = [matrix]
    Vn = X\Y;
    disp(Vn)
    %
    for i = 1:4
        Va(i) = (alpha * Vn(i)) + ((1-alpha) * Vo(i));
        Vo(i) = Va(i);
        if (abs(Va(1)-Vn(1)))<1e-3 
       break;
        end
    end

Best Answer

Voo = [30 15 13 10]; 
Vo=Voo
while ~all([Va==Vo,Vo==Vn]) (needs to be approx equal to)
  Vo=Voo
  Re1 = (D(1).*Vo(1)) / nu;
  Re2 = (D(2).*Vo(2)) / nu;
  Re3 = (D(3).*Vo(3)) / nu;
  Re4 = (D(4).*Vo(4)) / nu;
  A = [Matrix];
  b = [Matrix];
  Vn = A\b;% solves four unknowns at A\b % (1 col, 4 rows)
  for i = 1:4
      Va(i) = (alpha * Vn(i)) + ((1-alpha) * Vo(i)); %(1 col, 4 rows)
      Vo(i) = Va(i); %Used as Vo for each in next iteration. (1 col, 4 rows)
  end
end
Related Question