how to add 3 matrices with one dimension same for all and other dimension different?

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summyia qamar 2017-1-24

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评论： Niels 2017-1-24

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If I have

A=[1;
   2;
   3]
B=[2 3 4;
   5 6 7;
   8 9 0]
C=[3 4 5 6;
   9 8 7 6;
   5 4 2 1]

all 3 matrices have 3 rows but columns different. I want to add elements of rows of all matrices in this way for example I want

D=[(1+2+3) (1+2+4) (1+2+5) (1+2+6) (1+3+3) (1+3+4) (1+3+5) (1+3+6) (1+4+3) (1+4+4) (1+4+5) (1+4+6);
   (2+5+9) (2+5+8) (2+5+7) (2+5+6) (2+6+9) (2+6+8) (2+6+7) (2+6+6) (2+7+9) (2+7+8) (2+7+7) (2+7+6);
   (3+8+5) (3+8+4) (3+8+2) (3+8+1) (3+9+5) (3+9+4) (3+9+2) (3+9+1) (3+0+5) (3+0+4) (3+0+2) (3+0+1)]

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John Chilleri 2017-1-24

Do you need this generalized to any size matrix, or will it strictly be with three matrices of these exact sizes?

summyia qamar 2017-1-24

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to any kind..although my specific problem is

A=64x1
B=64x1806
C=64x4602
 so I need a generalized version

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Niels 2017-1-24

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编辑：Niels 2017-1-24

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[rows,col_B]=size(B);
[~,col_C]=size(C);
result=zeros(rows,col_B*col_C);
for i=1:col_B
    for  j=1:col_C
        result(:,(i-1)*col_C+j)=A+B(:,i)+C(:,j);
    end
end

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Niels 2017-1-24

that error occurs even before you even start your calculations

Niels 2017-1-24

the result will be that large, so even if the calculations are minimzed, the problem with the size of the result is still the same.

this might help you o set the limit higher https://de.mathworks.com/help/matlab/matlab_env/set-workspace-and-variable-preferences.html

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John Chilleri 2017-1-24

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编辑：John Chilleri 2017-1-24

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Hello,

I only tested this with your example and it worked, but I think it's generally correct:

%
% Strangely adding matrices
%
function D = strangelyAddingMatrices(A,B,C)
n = size(C,2);
nB = size(B,2);
for i = 1:n
  C(:,i) = C(:,i)+A;
end
D = [];
for i = 1:nB
  C2 = C;
  for j = 1:n
      C2(:,j) = C2(:,j)+B(:,i); 
  end
  D = [D C2]; 
end
end