Reading through folders getting the warning : ." Index in position 1 exceeds array bounds (must not exceed 1).".

Hello

The answer might be failry easy, but i am kind of stuck in it.

I'm trying to run through multiple subforlders to get a plot which contains data from all these folder. The goal is to compare the results.

But I get the Warning: " Index in position 1 exceeds array bounds (must not exceed 1). " in the second step when reading the files.

D_rough = 'C:\Users\ammar\OneDrive\Dokumenter\Master 2019\waves\Analysis\DATA_WAVE BASIN\Rough';
directories = dir(D_rough,'dir*');

I hope you can help :)

[Stephen23]

I would be very surprised if your code works without error, because you call dir with two input arguments:

dir(D_rough,'dir*')

whereas its documentation clearly only shows one input argument is supported. You need something like this:

dir(fullfile(D_rough,'dir*'))

"I get the Warning: " Index in position 1 exceeds array bounds (must not exceed 1). "

That is an error, not a warning.

[Ammar Alfaili]

To be honest I have tryied that one, but then I got This warning:

Answer 1

[the cyclist]

At some point, did you define a variable named dir? MATLAB would then try to access that variable, rather than the command. Clear that variable, and see if it works.

[Ammar Alfaili]

It is a long code and I have totally overlooked that I already have defined a variable named "dir".

Thanx a lot :)

[the cyclist]

The lesson here: Never use MATLAB keywords as variable names. :-)

[Ammar Alfaili]

Yes, Thanx a lot

Have a nice day :)

Answer 2

[Ammar Alfaili]

I thought this was going to be easy now there's a new problem.

After runnig the code, the plot doesn't appears. There is no warning though.

D_rough = 'C:\Users\ammar\OneDrive\Dokumenter\Master 2019\waves\Analysis\DATA_WAVE BASIN\Rough';
S = dir(fullfile(D_rough,'dir*'));
N = setdiff({S([S.isdir]).name},{'dir0','dir1','dir2','dir3'});         % list of subfolders of D_rough.
for ii = 1:numel(N)
    T1 = dir(fullfile(D_rough,N{ii},'dir*'));                           % improve by specifying the file extension.
    C = {T1(~[T1.isdir]).name};                                         % files in subfolder.
    for jj = 1:numel(C)
        F = fullfile(D_rough,N{ii},C{jj});
        figure()
        plot(tA,Fx)
        % hold on
        % plot(t_top3,max(Fx_chosen),'x','MarkerSize',20)
        % legend('')
        ylabel('\it Horizontal Force, F_x \rm [N]')
        xlabel('\it Time \rm [s]')
        grid
        title('filename')
        legend boxoff
        linkaxes(s,'x')
        set(gcf,'position',[381 678 1210 420]);
        xlim([t_top3-0.5*T t_top3+0.5*T]);  
    
%     cd('..')
end
end

I really don't know what's wrong this time .

I hope you can help

[the cyclist]

This is difficult to debug without access to the files you are trying to load. Do you know how to use the debugging tools?

I would set a breakpoint just after the plot command, to see if tA and Fx have values as you expect to be plotted. If not, work backward to see where the problem lies.

[Stephen23]

Your dir usage is very unusual. It is quite possible that none of it works as you expect.

For example:

S = dir(fullfile(D_rough,'dir*'));
N = setdiff({S([S.isdir]).name},{'dir0','dir1','dir2','dir3'});

You exclude the directories dir0, dir1, dir2 and dir3 from N. Is that really the intention? (In my original code that you copied this from, setdiff was used to remove . and ..)

T1 = dir(fullfile(D_rough,N{ii},'dir*'));                           % improve by specifying the file extension.
C = {T1(~[T1.isdir]).name};                                         % files in subfolder.

Are your files really named dir... ? That is highly unusual: you have subfolders named dir... and in them are files named dir..., without any file extensions. Possible, but very odd.

You even copied my code comment verbatim: did you follow my advice?

[Ammar Alfaili]

Hi Stephen

I guess i misunderstood the procedures and still have some doubts about it. Let me work on it and see if I can make it work. I have been busy with some other analysis lately.

But thanx for your advice :)