MATLAB: How to read data from multiple files and save in single file

for loopfprintfread datasavetext;write data

i have 5000 text files each file having(1*50). i need to read those all files from top to bottom order and want to save them in single text file.which should contain all data from those 5000 files(5000*50).

Best Answer

This concatenates the files directly without a conversion to doubles and back again:

pathName = 'C:\Temp';
fileList = dir(fullfile(pathName, '*.txt'));
out      = fopen(fullfile(pathName, 'Joined.txt'), 'w');
for k = 1:numel(fileList)
  s = fileread(fullfile(pathName, fileList(k).name));
  fwrite(out, s, 'char');
end
fclose(out);

Perhaps it is needed to care about a trailing line break:

if s(end) =~ char(10) && s(end-1:end) ~= char([13, 10])
  fwrite(out, char(10), 'char');  % Or char([13,10]) ?
end

Related Solutions

MATLAB: Problem with fscanf command in creating .txt file

    filename1 = ['*new.txt'];%filename

    fid_t=fopen(filename1,'r')

This cannot work: '*new.txt' is not a valid file name, because the * is not allowed.

fid_p = fopen('final.txt','w'); % writing file id
if fid_p < 0, error('Cannot open file for writing.'); end
x = dir ('*new.txt');
for i = 1:length(x)
    filename1 = x(i).name;  %filename
    fid_t = fopen(filename1, 'r');%open it and pass id to fscanf (reading file id)
    if fid_t < 0, error('Cannot open file for reading.'); end
    data = fread(fid_t, inf, '*char');%read data
    fwrite(fid_p, data, 'char');%print data in File_all
    fclose(fid_t);% close reading file id
    fprintf(fid_p,'\n');%add newline
end
fclose(fid_p); %close writing file id

This take the file name from the list of files in x. In addition it uses FREAD and FRWITE, because it is faster to access the files in binary mode.

Never use FOPEN without testing the success.

Working with relative paths is less reliable than absolute path names:

Folder = 'C:\Your\Folder';
FileList  = dir (fullfile(Folder, '*new.txt'));
for iFile = 1:numel(FileList)
    FileName = fullfile(Folder, FileList(iFile).name);
    ...
end

MATLAB: How to delete a particular row in multiple TXT files

Please take a look at the example code below which deletes the 3rd row of TXT files present in the current directory. The code reads in the TXT files in the current directory, deletes the 3rd row and saves the modified files to a new folder

files = dir('*.txt') ; %read all txt files in current directory
N = length(files) ;
mkdir newFiles % create new folder
for i = 1:N
  filename = files(i).name ;
  A=importdata(filename);
  A(3)=[];  %delete 3rd row
  fid = fopen(['newFiles/' filename],'wt');
  fprintf(fid,'%s\n', A{:});
  fclose(fid);
end

Best Answer

Related Solutions

MATLAB: Problem with fscanf command in creating .txt file

MATLAB: How to delete a particular row in multiple TXT files

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