How to modify this "for" loop so it can read maximum Y value instead of X?

Hi,

I have this code that reads maximum X value and its corresponding Y value, and prints all results (Y values) in one file.

I just need to modify this code, so it can read the maximum Y value.

For example, for the following set of data:

X Y

1 2

2 16

3 9

4 15

The code reads 4 (as the maximum X value) and prints 15 (as the corresponding Y value to the maximum X).

However, I need the modified code to just read and print 16 (as the maximum Y value).

The code:

S = dir('*.out');
C = natsortfiles({S.name});
N = numel(C);
g = 10;
Z = nan(g,1);
for k = 1:N/g
    for j = 1:g;
        data = load(C{10*(k-1)+j}); 
        [~,idx] = max(data(:,1));
        Z(j) = data(idx,2);
    end
    dlmwrite(['Result_',num2str(k),'.txt'],Z);
end

Answer 1

[Walter Roberson]

max(data(:,2)) instead of max(data(:,1)) . And on the next line assign from data(idx,1) instead of data(idx,2) if you want the corresponding X value, or leave it as-is if you want the y value.

[Ismail Qeshta]

Hi Walter,

Many thanks for your answer.

I tried it but it does not seem to work. It basically prints one value for all.

The original code actually gets the Y value that corresponds to the maximum X, while I need only the maximum Y value.

[Walter Roberson]

S = dir('*.out');
C = natsortfiles({S.name});
N = numel(C);
g = 10;
for k = 1:N/g
    Z = nan(g,1);
    for j = 1:g;
        data = load(C{10*(k-1)+j}); 
        Z(j) = max(data(:,2));
    end
    dlmwrite(['Result_',num2str(k),'.txt'],Z);
end

[Ismail Qeshta]

Hi Walter,

Great. Now it works well. Thank you very much.

Yes. It is acutally the second line. It should be Z(j) = data(idx,2) instead of Z(j) = data(idx,1) because we need to read and print Y not X.

Thank you again for your time and help.