How to sort the results correctly in this "for" loop?

Hi,

I need to find the Y value that corresponds to the maximum X value for the curves attached herewith for 10 files.

I am using the code given below, but the output starts with file1, file10, file2, file3, ..., file9. It should be file1, file2, file3, .., file10.

Can anyone please help me with this?

Thank you.

files = dir('*.out') ;
N = length(files) ;
iwant = zeros(N,2) ;
for i = 1:N
    data = load(files(i).name) ;
    [val,idx] = max(data(:,1)) ;
    iwant(i,:) = [val data(idx,2)] ;
end

Answer 1

[Stephen23]

Simply download my FEX submission natsortfiles:

https://www.mathworks.com/matlabcentral/fileexchange/47434-natural-order-filename-sort

And follow the examples in its documentation, e.g.:

S = dir('*.out');
C = natsortfiles({S.name});
N = numel(C);
Z = zeros(N,2);
for k = 1:N
    data = load(C{k});
    [val,idx] = max(data(:,1));
    Z(k,:) = [val,data(idx,2)];
end

[Ismail Qeshta]

Hi Stephen,

Many thanks for your help. I am downloading it now.

The other thing is that the output is a file with two columns. I only need to print in a file the second column. Could you please help me with this?

The updated code is:

files = dir('*.out') ;
N = length(files) ;
iwant = zeros(N,2) ;
for i = 1:N
    data = load(files(i).name) ;
    [val,idx] = max(data(:,1)) ;
    iwant(i,:) = [val data(idx,2)] ;
        save RedsidualDisp_0.5.txt iwant -ascii ;

end

[Stephen23]

"The updated code ..." has very little to do with my answer.

Try this:

S = dir('*.out');
C = natsortfiles({S.name});
N = numel(C);
Z = nan(N,1);
for k = 1:N
    data = load(C{k}); % why not dlmread or csvread or ... ?
    [~,idx] = max(data(:,1));
    Z(k) = data(idx,2);
end
dlmwrite('test.txt',Z)

[Ismail Qeshta]

Hi Stephen,

Thank you very much for the suggested code. I still can't open it unless I download the FEX submission.

I opened that page and downloaded a zip file that contains one matlab file and one text file. I ran the matlab file but no download started. Would it be possible to let me know how the download is usually done?

[Stephen23]

"I opened that page and downloaded a zip file that contains one matlab file and one text file."

Then you did not download from the page that I linked to: the zip file contains three .m files and one .txt file (I just checked this now).

Once you download the zip file from the page that I gave you, then the zip file contains everything that you need. Simply unzip it and put the .m files into your current directory (or somewhere on your MATLAB path) and you are ready to use them (exactly as I showed in my answer). You do not need to set up anything or "run" anything to use them, they are quite normal MATLAB functions that you can use straight away just by calling them exactly like you would call any other MATLAB function.

[Ismail Qeshta]

Thank you very much Stephen. That was really helpful. I just did that and it worked well.