MATLAB Answers

How can I Run the Code On Multiple data Files (.txt) sequentially from a folder

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SA on 24 Mar 2021
Edited: SA on 2 Apr 2021
Hi All,
I would like to write a script that will open a group (10 or 20 files at once w.r.t time sequence) of .txt files from a folder (contain some thousands of data files). So far the following script sound good but each time I need to select the 10 or 20 files manually. Is there any way to read the 10 or 20 files automatically and in this way I can read all the files inside the folder? I think there should be a smart way in matlab, Can anybody please help me to get me out from here?
Thanks in advance
[file_list, path_]=uigetfile('*.txt','Grab the file first','files Want to Select automatic','Multiselect','on');
for i=length(file_list)
original_path =[path, file_list(i)]
N.B. I use Matlab 2018 version

Accepted Answer

Walter Roberson
Walter Roberson on 26 Mar 2021
per_group = 10;
p = dir('CTS_main-128361*.txt');
nFiles = numel(p);
for base_k = 1:per_group:nFiles
group_end = min(nFiles, base_k+per_group-1);
group_size = group_end - base_k + 1;
A_cat = cell(group_size, 1);
for k = base_k : group_end
A = dlmread(p(k).name);
A_cat{k} = cell2mat(A);
A = vertcat(A_cat{:});
%do something with this group of 10
Walter Roberson
Walter Roberson on 30 Mar 2021
xlabel(sprintf('1s mean Pulse from UTC time #(%d to %d)', posixtime(utcTimeStamp(1st of base_k)), posixtime(utcTimeStamp(end of base_k)));

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More Answers (1)

Mohammad Sami
Mohammad Sami on 25 Mar 2021
Edited: Mohammad Sami on 26 Mar 2021
From your question I assume that you want to essentially read all the files, not just 10-20 files.
You can essentially use uigetdir to get the folder that you want to load the files from.
Then use the dir function to list all the txt files inside the selected folder.
p = uigetdir; % updated var from path to p
files = dir(fullfile(p,'*.txt'));
data = cell(length(files),1);
for i = 1:length(files)
filepath = fullfile(files(i).folder,files(i).name);
data{i} = readtable(filepath); % assuming your data can be read with readtable.
% do something with your data.
Mohammad Sami
Mohammad Sami on 26 Mar 2021
p = uigetdir; % changed var from path to p
% based on your comments assuming your file names are like
% CTS_main-1234567890.txt
files = dir(fullfile(p,'CTS_main-*.txt'));
files = struct2table(files); = str2double(extractBetween(,'CTS_main-','.txt');
files.g = floor( / 10000); % create file grouping. adjust groups here
ug = unique(g);
for j = 1:length(ug)
% load one group of data
k = files.g == ug(j);
filesg = files(k,:);
data = cell(length(filesg),1);
for i = 1:length(filesg)
filepath = fullfile(filesg.folder{i},{i});
data{i} = readtable(filepath); % assuming your data can be read with readtable.
data = vertcat(data{:});
% do something with the current group of data

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