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.

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


    

[MANOGNA POTLURI]

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]

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

Answer 1

[David Hill]

Why not just:

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