Output name same as input names but with an extra word at the end to distinguish

Hello ,

I have many files in a folder . I have written a matlab code to do something. Now I am looking to save the output file with the same name as the input file but with an extra word at the end to distinguish since they are all going to be in the same folder.

Here is just an idea

Input file = A.txt

Output file = A.edited.txt

Is it possible to do this? I should also mention that the files are going to be in a folder and I want to have a loop where the code would read one file at a time, do what I want it to do and save it as a excel file with the modified input name.

Thanks

Answer 1

[Adam Danz]

If you're reading in a txt file and saving an excel file, you don't need to have different names but it still might be a good idea to add the "edited" tag so you can keep track of which data you're looking at.

Avoid using dots in filenames since they indicate file extensions. Underscores a better.

inputfile = 'A.txt'; 
[~,fname] = fileparts(inputfile); 
outputfile = sprintf('%s_edited.xlsx',fname); 

Result

outputfile =
    'A_edited.xlsx'

[Gopika Rajan]

Thanks. I am going to try this now.

[Gopika Rajan]

Hi,

Would fileparts also work when I am using fopen to read the file? There are a few lines in the data that I want to remove so I am using fget1 for the same.

fid = fopen('LEG3.txt', 'r') ;              % Open source file.
 fgetl(fid) ;                                  % Read/discard line.
 fgetl(fid) ;                                  % Read/discard line.
 fgetl(fid) ;                                  % Read/discard line.
 fgetl(fid) ;                                  % Read/discard line.
 fgetl(fid) ;                                  % Read/discard line.
 fgetl(fid) ;                                  % Read/discard line.
 buffer = fread(fid, Inf) ;                    % Read rest of the file.
 fname = fileparts(fid);  % <---BOLD [edit: AD]  
 fclose(fid);
 fid = fopen(sprintf('%s_truncated.txt',fname), 'w');  ;   % Open destination file.
 fwrite(fid, buffer) ;                         % Save to file.
 fclose(fid) ;

The line in bold is where the error is shown.

Error using fileparts (line 37)
Input must be a row vector of characters or string scalar.

Error in SCript (line 9)
 fname = fileparts(fid);

Any idea where I am going wrong?

[Adam Danz]

No, in that case, move the filename to a variable.

inputfilename = 'LEG3.txt'l 
fid = fopen(inputfilename, 'r') ;              % Open source file.
[~, fname] = fileparts(inputfilename);  
% ^...........path to file (missing because your filename does not include a path
% ..^^^^^.....name of file

[Gopika Rajan]

Thanks. It is working great. Could you help me with another related problem? The files are going to be in a folder and I want to have a loop where the code would read one file at a time, do what I want it to do and save it as a txt file with the modified input name(where I would be using the code you suggested.

[Adam Danz]

I'm not sure what the question is. I'm guessing your quesiton is how to list each file and read it in individually.

You can use dir() to list the content of a directory. This line below, for example, reads in lists all txt files in a directory.

% chosenPath is the path to your folder
files = dir(fullfile(chosenPath, '*.txt'));
filenames = {files.name}; 

Then can loop through those files

for i = 1:numel(filenames)
    filenames{i} 
end