How to do a gauss partial pivot?

Question

Kevser Cifci 2021-9-27

0
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https://ww2.mathworks.cn/matlabcentral/answers/1461739-how-to-do-a-gauss-partial-pivot

评论： Kevser Cifci 2021-9-27

Hi,

For each row, I want to find the absolute maximum and divide the other elements on the same row with the maximum. I want to do this with each row.

A = [1 2 3; 2 -1 1; 1 1 1]
n = size (A,1);
maximum = 0;
for k = 1 : n
    for i = 1 : n 
        if abs(A(k,i)) >= maximum
            maximum = A(k,i);
        end 
        A(k,i) = A(k,i)/maximum;
    end 
end
A

My algorithm is not giving me the right matrix. Can you help me please?

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Answer 1

the cyclist 2021-9-27

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https://ww2.mathworks.cn/matlabcentral/answers/1461739-how-to-do-a-gauss-partial-pivot#answer_796259

在 MATLAB Online 中打开

A = [1 2 3; 2 -1 1; 1 1 1]
A = 3×3
     1     2     3
     2    -1     1
     1     1     1
A./abs(max(A,[],2))
ans = 3×3
    0.3333    0.6667    1.0000
    1.0000   -0.5000    0.5000
    1.0000    1.0000    1.0000