MATLAB: How to place each answer under a one column matrix

Question

r = [1, 2.5, 3.25, 4.3, 7.6];
h = [12.3, 14.1, 17.6];
j =15;
    for i = 1:length(r);
        for k = 1:length(h);
            vol = (1/3)*pi*r(i)*h(k)
        end   
    end

Answer 1

r = [1, 2.5, 3.25, 4.3, 7.6];
h = [12.3, 14.1, 17.6];
j =1;
vol=zeros(15,1); % preallocate
    for i = 1:length(r);
        for k = 1:length(h);
            vol(j,1) = (1/3)*pi*r(i)*h(k);
                    j=j+1;
        end 
    end   

Gives:

    vol =
   12.8805
   14.7655
   18.4307
   32.2013
   36.9137
   46.0767
   41.8617
   47.9878
   59.8997
   55.3863
   63.4916
   79.2519
   97.8920
  112.2177
  140.0731