I have to find the sum of the elements in the upper dimension matrix and this is the code i came up with. When I submitted this code it's showing error.

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MANOGNA POTLURI 2020-7-14

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https://ww2.mathworks.cn/matlabcentral/answers/565043-i-have-to-find-the-sum-of-the-elements-in-the-upper-dimension-matrix-and-this-is-the-code-i-came-up

评论： MANOGNA POTLURI 2020-7-14

function summa=halfsum(A)
n=length(A);
k=1;
[m,p]=size(A);
if m~=p
    return
else
    summa=0;
for i=1:n
    for j=k:n
        summa=summa+A(i,j);
    end
    k=k+1;
end
end
    

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MANOGNA POTLURI 2020-7-14

在 MATLAB Online 中打开

function summa=halfsum(A)
summa=0;
n=length(A);
k=1;
[m,p]=size(A);
if m~=p
    if p>m
    A(p,p)=0;
    elseif m>p
        A(m,m)=0;
    end
end
    
for i=1:n
    for j=k:n
        summa=summa+A(i,j);
    end
    k=k+1;
end
end
 

MANOGNA POTLURI 2020-7-14

i got it now; the prof also wants to convert a non-square matrix to a square matrix and then find the halfsum.

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Answer 1

David Hill 2020-7-14

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https://ww2.mathworks.cn/matlabcentral/answers/565043-i-have-to-find-the-sum-of-the-elements-in-the-upper-dimension-matrix-and-this-is-the-code-i-came-up#answer_465797

在 MATLAB Online 中打开

Why not just:

[a,b]=size(A);
if a==b
    summa=sum(triu(A),'all');
end

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I have to find the sum of the elements in the upper dimension matrix and this is the code i came up with. When I submitted this code it's showing error.

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I have to find the sum of the elements in the upper dimension matrix and this is the code i came up with. When I submitted this code it's showing error.

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