How to insert and analyze as signal a column from a txt file.

Hi everyone,have a happy new year,i am a new member in this community and this is my first question.

I am a master student,my problem is that i am trying to insert a set of data given from a set of txt files in order to analyze them in the context of an assing in a subject.

Data are given in a set of txt files and must be taken from a specific column of each file for exmaple 1st or 5ht.Each column data are a time domain amplitude counting and the function that are composing must be analyzed with a plenty of diagnostical tools like fast fourier transform,wavelet denoiser etc ,and must be extracted from this analysis a planty of caracteristics like rms values,cyrtosisvalues etc

My problem is that the apps of each tool doesn't give neither the option to insert data directely from a text file,nor to extract characteristics from them.

I found a list with proper commands in order to make my assing.If you can help me in order to find something i would appriciate it

Thanks a lot from your time.

Answer 1

[Mathieu NOE]

hello and welcome in this forum !

here a starter - how to list and import multiple txt files - after remains to implement your own code for data analysis

if you want the file names / folders be sorted in natural order (what matlab fail to do) , you need to use the function natsortfiles , which is available in the File Exchange section (FEX in short) : Natural-Order Filename Sort - File Exchange - MATLAB Central (mathworks.com)

clc
clearvars

S = dir('**/*.txt');
S = natsortfiles(S); % natsortfiles now works on the entire structure

%% main loop 

for k = 1:numel(S)

    foldername = S(k).folder;
    filename = S(k).name;
    F = fullfile(foldername, filename);
    data = importdata(F, ' ', 2); % or any other function adapted to data loading
    %%%% your code here %%%%%%%%
        
end

[Anastasios Kyriakopoulos]

Thank you very much my friend,I am going to try it immediately.

[Mathieu NOE]

my pleasure !

[Mathieu NOE]

hello

problem solved ?