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Suming vectors which are produced in a loop

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Steven Martin
Steven Martin 2018-3-27
评论： Stephen23 2018-3-27
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]
  1 个评论
Stephen23
Stephen23 2018-3-27

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

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采纳的回答

Birdman
Birdman 2018-3-27
编辑：Birdman 2018-3-27
n=3;
sumV=zeros(n,1);
for i = 1:n
V = [i; 2*i; 3*i];
sumV(i,1)=sum(V,1);
end
  2 个评论
Steven Martin
Steven Martin 2018-3-27
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

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