how sum all element which are the right of diagonal. where row=colom .....i have done this much but confuse in further operation
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function summa = halfsum(A)
%A = randi(n,x,y);
[row,col] = size(A);
if row == col
for r = 1:row
for c = 1:col
summa = sum(A(r,c)) + sum(A(r,c));
end
end
else
fprintf('Input correct matrix.\n')
end
end
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/366910/image.jpeg)
2 commentaires
Image Analyst
le 26 Sep 2020
Is this homework (sounds a lot like it)? If so, tag as homework. In the meantime, check out triu() and tril(), and consider if r <= or >= c
if c >= r % or....
if c <= r
if you want/need to do it as a for loop.
Réponses (1)
KSSV
le 26 Sep 2020
Modifié(e) : KSSV
le 26 Sep 2020
Read about triu.
If A is your matrix, use:
iwant = sum(sum(triu(A)))
3 commentaires
KSSV
le 26 Sep 2020
Read the documentation..it is clear in the documentation.
Also you can use loops like below:
A = rand(3) ;
[m,n] = size(A) ;
upper_diagonal = zeros([],1) ;
count = 0 ;
for i = 1:m
for j = 1:n
if i<=j
count = count+1 ;
upper_diagonal(count) = A(i,j) ;
end
end
end
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