how can i find the sum of matrix elements

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Luzan Obeidat
Luzan Obeidat le 16 Avr 2014
Modifié(e) : Star Strider le 16 Avr 2014
if i have a two dimension matrix i want to create a for loop to compute the summation of element in this matrix like : sum= 0 for i=1 to n for j= 1 to m sum= sum + a[j,j] but in matlab!!!

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Réponses (2)

Azzi Abdelmalek
Azzi Abdelmalek le 16 Avr 2014
You can use sum function
sum(A(:))
Star Strider
Star Strider le 16 Avr 2014
Modifié(e) : Star Strider le 16 Avr 2014
If you want to sum the diagonal elements of a, I suggest:
a = rand(5,5);
sd = sum(diag(a));
Do not use sum as a variable name. It is a built-in MATLAB function, and using it as a variable name will cause problems later in your code.
If you want the sum of all the elements in your matrix, I suggest:
sa = sum(a(:));

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