how to sum a vector without sum function
27 vues (au cours des 30 derniers jours)
Afficher commentaires plus anciens
function Mean = mean_strength(StrengthVector)
N = numel(StrengthVector);
x = sum(StrengthVector);
for i = 1:N
Mean = (1/N)*(x);
end
I need to change my code so I don't use the in built Matlab sum function.
0 commentaires
Réponses (5)
KL
le 3 Sep 2018
Modifié(e) : KL
le 4 Nov 2020
Your idea of using for loop is correct but you should use it to calculate the sum not the mean.
If there's a vector A = [1,2,3,4,5], how would you calculate the sum? By adding its elements with each other, right? It's pretty much the same here.
- create a resuting variable and initilize it to 0
result_sum = 0;
- use the for loop to index through A and add the current element to the above variable
result_sum = result_sum + A(i);
- once you are done with the for loop calculate mean by diving it with N (just like you've done but outside the loop)
0 commentaires
Dennis
le 3 Sep 2018
If the only requirement is to not use sum, i'd like to suggest to use cumsum instead!
A=cumsum(StrengthVector);
x=A(end);
As an alternative you could use a loop.
0 commentaires
Matt J
le 3 Sep 2018
Modifié(e) : Matt J
le 3 Sep 2018
You can do all sorts of crazy things,
function Mean = mean_strength(StrengthVector)
N = numel(StrengthVector);
if N==1
Mean = StrengthVector;
else
Mean = StrengthVector(1)/N + (N-1)/N*mean_strength( StrengthVector(2:end) );
end
end
0 commentaires
Voir également
Catégories
En savoir plus sur Loops and Conditional Statements 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!