how to add 3 matrices with one dimension same for all and other dimension different?
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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)]
2 Commenti
John Chilleri
il 24 Gen 2017
Do you need this generalized to any size matrix, or will it strictly be with three matrices of these exact sizes?
Risposta accettata
Niels
il 24 Gen 2017
Modificato: Niels
il 24 Gen 2017
[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
11 Commenti
Niels
il 24 Gen 2017
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
Più risposte (1)
John Chilleri
il 24 Gen 2017
Modificato: John Chilleri
il 24 Gen 2017
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
Hope this helps!
9 Commenti
John Chilleri
il 24 Gen 2017
What do you mean by minimum sum? Like which columns summed produce the minimum? Or something else?
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