How to find the maximum value from a matrix without using max syntax?

Question

Kenny Gee 2022-3-1

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https://ww2.mathworks.cn/matlabcentral/answers/1661360-how-to-find-the-maximum-value-from-a-matrix-without-using-max-syntax

编辑： Davide Masiello 2022-3-1

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I have to find a max value without using matlab built in max syntax.

The code I have that I want to change the max syntax to for loop is

[i j] = max(abs(A(y:n, y)));

I tried following this code I found from another question:

 MaxValue = -Inf;
 row = 0;
 column = 0;
 for y = 1:size(A, 1)
     for y = 1:size(A, 2)
         if A(y, y) > MaxValue
             MaxValue = A(y:n, y);
             row = y:n;
             column = y;
         end
     end
 end

but my code is not running. I don't know where I am going wrong.

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Answer 1

David Hill 2022-3-1

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s=sort(A);
maxValue=s(end);

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Answer 2

Cris LaPierre 2022-3-1

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I suspect one issue to fix is that you use the same variable name for both loops. The variable can only hold one value at a time, so the loops are definitely not behaving as you intended.

for y = 1:size(A, 1)
     for y = 1:size(A, 2)

Use a different variable for each loop.

for y1 = 1:size(A, 1)
     for y2 = 1:size(A, 2)

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Answer 3

Davide Masiello 2022-3-1

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编辑：Davide Masiello 2022-3-1

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I guess you could try something like this

A = randi(100,4,8);
for i = 1:size(A,1)
    for j = 1:size(A,2)
       if any(A(i,j)< A(:))
       else
           maxA = A(i,j);
           row  = i;
           col  = j;          
       end
    end
end
disp(A)
disp(maxA)
disp([row col])