how to use abs function in this code?

Question

Ozan Mirzanli 2020-5-26

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/533978-how-to-use-abs-function-in-this-code

评论： Ozan Mirzanli 2020-5-26

%Write a Matlab script to create random integer matrix with elements between -30 and 30. 
%The size of the matrix must be first be read from user input. Use loops to sum of each row. 
%Then find the differences between all pairs of these sums. 
a=input('Enter the size of rows:');
b=input('Enter the size of columns:');
A=randi([-30 30],a,b)
r=zeros(a);
d=zeros(a);
for i=1:a
    for j=1:b
    r(i)=r(i)+A(i,j);
    end
end
for k=1:a
    for l=1:a
     d(k,l)=(r(k)-r(l));   
    end
end
difference=triu(d,1)
%So I write this code and it worked -with a problem-. Let's say I created a 2x2 Matrix. 
%TheSumOfFirstRow=2, TheSumOfSecondRow=3. As the result I wanna see both 2-3=-1 and 3-2=1.
%But the code that I wrote calculates just 2-3=-1.
Can someone please help :)

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Answer 1

KALYAN ACHARJYA 2020-5-26

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a=input('Enter the size of rows:');
b=input('Enter the size of columns:');
A=randi([-30 30],a,b)
r=zeros(a);
d=zeros(a);
for i=1:a
    for j=1:b
    r(i)=r(i)+A(i,j);
    end
end
for k=1:a
    for l=1:a
     d(k,l)=abs((r(k)-r(l)));   
    end
end
difference=triu(d,1)