Effacer les filtres
Effacer les filtres

Adding two matrixes with different row numbers.

1 vue (au cours des 30 derniers jours)
Santos García Rosado
Santos García Rosado le 26 Fév 2021
Hi Mathworks community!
I have a matrix A(mxn) and a matrix B(lxn) such as:
A = [1,2,3,4,5,6,7,8,9,10; 10,11,12,13,14,15,16,17,18,19; 19,20,21,22,23,24,25,26,27,28];
B = [1,2,3,4,5,6,7,8,9,10; 2,4,6,8,10,12,14,18,18,20];
I'd like to get an output such as:
out = [sum(A(1,:),B(1,:)); sum(A(1,:),B(2,:)); sum(A(2,:),B(1,:)); sum(A(2,:),B(2,:)); sum(A(3,:),B(1,:)); sum(A(3,:),B(2,:))];
Any idea about how I could code this efficiently?
Thank's in advance!
Santos García

Réponse acceptée

Stephen23
Stephen23 le 26 Fév 2021
A = [1,2,3,4,5,6,7,8,9,10; 10,11,12,13,14,15,16,17,18,19; 19,20,21,22,23,24,25,26,27,28];
B = [1,2,3,4,5,6,7,8,9,10; 2,4,6,8,10,12,14,18,18,20];
[Y,X] = ndgrid(1:size(B,1),1:size(A,1));
out = A(X(:),:) + B(Y(:),:)
out = 6×10
2 4 6 8 10 12 14 16 18 20 3 6 9 12 15 18 21 26 27 30 11 13 15 17 19 21 23 25 27 29 12 15 18 21 24 27 30 35 36 39 20 22 24 26 28 30 32 34 36 38 21 24 27 30 33 36 39 44 45 48
  1 commentaire
Santos García Rosado
Santos García Rosado le 26 Fév 2021
Great Stephen! I really appreciate avoiding a loop. Thank's for the help!

Connectez-vous pour commenter.

Plus de réponses (1)

Hernia Baby
Hernia Baby le 26 Fév 2021
Following your output image,
out = [sum(A(1,:),B(1,:)); sum(A(1,:),B(2,:)); sum(A(2,:),B(1,:)); sum(A(2,:),B(2,:)); sum(A(3,:),B(1,:)); sum(A(3,:),B(2,:))];
the code is like below
A = [1,2,3,4,5,6,7,8,9,10; 10,11,12,13,14,15,16,17,18,19; 19,20,21,22,23,24,25,26,27,28];
B = [1,2,3,4,5,6,7,8,9,10; 2,4,6,8,10,12,14,18,18,20];
A_sum = sum(A,2);
B_sum = sum(B,2);
for i = 1:length(A_sum)
for j = 1:length(B_sum)
C(i,j) = A_sum(i) + B_sum(j);
end
end
out = rehape(C,[],1);
  1 commentaire
Santos García Rosado
Santos García Rosado le 26 Fév 2021
Thank's Hernia. Your code works fine!

Connectez-vous pour commenter.

Catégories

En savoir plus sur Resizing and Reshaping Matrices dans Help Center et File Exchange

Produits


Version

R2020b

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by