Sum of an arrays elements

7 vues (au cours des 30 derniers jours)
Rasmus
Rasmus le 23 Fév 2014
Commenté : Rasmus le 23 Fév 2014
I have an assigntment which sounds like this:
square each element in C and determine the sum of all C's elements
How do i do this? I don't get the right result, that i am supposed to get.

Réponse acceptée

Mischa Kim
Mischa Kim le 23 Fév 2014
Modifié(e) : Mischa Kim le 23 Fév 2014
I'd assume
C = [1 2 3];
res = sum(C.^2)
What is the input, what is the expected result?
  9 commentaires
Mischa Kim
Mischa Kim le 23 Fév 2014
A = [10 12 15; 7 9 13];
B = A';
C = ones(4,10);
C(2,5) = 8;
C(:,7) = zeros(4,1);
C(1:2,1:3) = A;
C(2:4,8:9) = B;
C(3,:) = [];
sum(sum(C.^2))
ans =
1391
Rasmus
Rasmus le 23 Fév 2014
Hmm weird, that was pretty much what i was doing, but at least now i get the same result.
Thnak you :)

Connectez-vous pour commenter.

Plus de réponses (1)

Sagar Damle
Sagar Damle le 23 Fév 2014
Rasmus,entered matrix is wrong again! I get this fact from your description. Your matrix is - C =
10 12 15 1 1 1 0 1 1 1
7 9 13 1 8 1 0 10 7 1
1 1 1 1 1 1 0 15 13 1
Any way,I think this is what you want :
A = C.^2; Ans = sum(A(:));
For understanding purpose,see effect of A(:).
Note : For 2-dimentional matrix A, sum(sum(A)) is same as sum(A(:)).
Read help about 'sum()' in MATLAB help.

Catégories

En savoir plus sur Multidimensional Arrays dans Help Center et File Exchange

Community Treasure Hunt

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

Start Hunting!

Translated by