How to calculate norm for multiple .csv in different folders?

Hi,

I have 10 folders with different numbers of .csv files and want to calculate the norm for every single .csv file. But the code i use only calculates the norm for a whole folder and not for every .csv in a folder (hope you get my point). So i get 10 values for norm but it should be much more.

clear all
close all
%%
anfang = [2,2,8,3,5,5,3,5,4,4];
ordern = {'00_00','00_01','01_00','01_01' '02_00' , '02_01' , '03_00' , '03_01','04_00','04_01'};


for idx3 = 1 : length(ordern)
    filename = dir(fullfile(ordern {idx3},'*.csv'));
   
    for idx2 = 1 : length(filename)
        filename_cell{idx2} =  filename(idx2).name;
    end
    
    filename_sort = natsortfiles(filename_cell);
    
    for idx1 = 1 : length(filename_cell)
        Data = readtable(fullfile(ordern {idx3},filename_sort{idx1}));
        Data = table2array(Data);
        y {idx3}= Data(:,1);
        T(:,idx1) =  Data(:,2);
    end
    %%
    Tnorm {idx3} = norm(T(:,anfang(idx3):end));
	
    clear T filename_cell filename_sort Data filename
end

[Jan]

Neither the initial clear all nor the clearing inside the loop are useful in Matlab, but they waste time only.

Answer 1

[Jan]

norm() calculates a matrix norm, if you provide a matrix as input. so you get a scalar output.

Maybe you want to use vecnorm instead:

Tnorm {idx3} = vecnorm(T(:,anfang(idx3):end), 2, 2);
%                                or maybe 1 here ^ as dimension?

[Tim K]

Thank you!