MATLAB: Reading files and writing with new extension

file names

I am trying to read a bunch of images in a directory and after some processing I want to use image file's names to write and save a new file same as the image file names. I am close but having issue to get rid of image file extension in the new file names. When I save new file (a .txt file) using the image file name, I also get image extension. I am pasting below the code I am using, please help me to figure this out.
This code gives me output in the form, e.g; img1.jpg.txt. What I want is img1.txt.
%Specify the folder where the file live
myFolder='C:\Users\UserName\Desktop\test';
cd(myFolder);
%Check to make sure the folder actually exists
if ~isfolder(myFolder)
    errorMessage=sprintf('Error: the following folder does not exist:\n%s', myFolder);
uiwait(warndlg(errorMessage));
return;
end
% get the list of all files in the folder with desired file pattern/type.
filePattern=fullfile(myFolder, '*.jpg');
theFiles=dir(filePattern);
jpgFiles = cell(1, numel(theFiles));
for k=1:length(theFiles)
    baseFileName=theFiles(k).name;
    jpgFiles{k} = baseFileName; 
end
A = [1 2 3; 4 5 6; 7 8 9];
for i=1:numel(theFiles)
    txtFileName = fullfile(myFolder, sprintf([jpgFiles{i},'.txt']));
    txtFileID = fopen(txtFileName, 'w');
    fprintf(txtFileID, 'myHeader 1, myHeader 2 \n');
    fprintf(txtFileID, '%d \n', A);
    fclose(txtFileID);   
end

Best Answer

Use fileparts, something like this:
[~,fnm] = fileparts(jpgFiles{i});
fullfile(myFolder, sprintf('%s.txt',fnm))
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