Suming vectors which are produced in a loop

Say I have a loop which returns three vectors:

for i = 1:3

V = [i; 2*i; 3*i];

end

returning

V = [1; 2; 3] V = [2; 4; 6] V = [3; 6; 9]

how do i then sum these to get

sumV = [1+2+3; 2+4+6; 3+6+9]

[Stephen23]

Why not just

>> 6:6:18
ans =
  6   12   18

Or

>> 6*(1:3)
ans =
  6   12   18

Or using bsxfun:

>> sum(bsxfun(@times,1:3,(1:3).'),1)
ans =
  6   12   18

Or if you really want to use a loop (which is a waste of MATLAB):

>> V = zeros(1,3);
>> for k = 1:numel(V), V(k)=sum(k*(1:3)); end
>> V
V =
  6   12   18

Answer 1

[Birdman]

n=3;
sumV=zeros(n,1);
for i = 1:n
   V = [i; 2*i; 3*i];
   sumV(i,1)=sum(V,1);
end

[Steven Martin]

This then returns 3 vectors I only want it to return one (the last one) as I want to use this in my code later on

[Birdman]

Not 3 vectors, it returns only one vector:

 sumV =

      6
     12
     18