MATLAB: How to read data from different text file in a loop, save in a matrix and plot?

for loopread data

Hello,

For example I have different data file named data1.txt, data2.txt, data3.txt… etc. Now I want to read the data from each text file one by one using a loop and save them in a matrix and then plot. I'm out of my depth here.

Any help would be very much appreciated. Thanks..!!

Best Answer

A regular google will give you ton's of sites. This topic is discussed to death in mathworks.

dinfo = dir('*.txt');  % get the text files from folder 
for K = 1 : length(dinfo)
  thisfilename = dinfo(K).name;  %just the name
    %load this file 
    % thisdata = load(thisfilename); 
end

plotting, reading the file depends on how your text file is.

Related Solutions

MATLAB: Combine multiple text files into one matrix

projectdir = 'directory_name_goes_here';
dinfo = dir( fullfile(projectdir, '*.txt'));
nfiles = length(dinfo);
assert(nfiles == 100, 'expected 100 files');
filenames = fullfile(projectdir, {dinfo.name});
data = zeros(nfiles, 50);
for K = 1 : nfiles
    thisfile = filenames{K};
    thisdata = load(thisfile);
    data(K, :) = thisdata;
end

Caution: if your files are named something like 'data1.txt', 'data2.txt', ... 'data10.txt', 'data11.txt' ... then the above code will not load them in that order: it will load 'data1.txt', 'data11.txt', 'data12.txt', ... 'data2.txt', 'data21.txt', ... See the File Exchange for "natural directory sort"

MATLAB: Rename files in a directory

Another possible solution:

f = dir('*.csv');
for kk = 1:numel(f)
  fileFrom = f(kk).name;
  fileTo = ['data',erase(f(kk).name,'0.csv'),'.csv'];
  movefile(fileFrom,fileTo);
end

Best Answer

Related Solutions

MATLAB: Combine multiple text files into one matrix

MATLAB: Rename files in a directory

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