How to add filename as a variable in MATLAB?

I have a folder of 1000 .mat files which each of these .mat files is a structure of two fields DH12 and HRF. My aim is to create a csv file that has three columns SubjectID, DH12, HRF. Subjects IDs are the same as the .mat files names that could be extracted by sprintf(name) based on the code below. The output of this loop gives me a table of two columns DH12 and HRF, how can I add the subject ID as a column based on the filenames.

files = dir('*.mat')
for i = 1:numel(files)
    mat_filename = fullfile(files(i).folder, files(i).name);
    [~, name] = fileparts(files(i).name);
    csv_filename = fullfile(files(i).folder, [name '.csv']);
    data = load(mat_filename);
    X = data.params.f.DH12;
    Y = data.params.f.HRF;
    Z = horzcat(X,Y);
    colNames = {'DH12','HRF'};
    sTable(i,:)= array2table(Z,'VariableNames',colNames)
end

Answer 1

[Walter Roberson]

files = dir('*.mat');
numFiles = numel(files);
sTables = table();
for i = 1:numFiles
    mat_filename = fullfile(files(i).folder, files(i).name);
    [~, name] = fileparts(files(i).name);
    csv_filename = fullfile(files(i).folder, [name '.csv']);
    data = load(mat_filename);
    X = data.params.f.DH12;
    Y = data.params.f.HRF;
    colNames = {'DH12','HRF'};
    sTable = table(X, Y, 'VariableNames', colNames);
    [~, sid, ~] = fileparts(csv_filename);
    sTable.SubjectID(1:height(sTable)) = {sid};
    sTables = [sTables; sTable];
end

[Katie]

Thanks for your reply. This code has the error "Unrecognized function or variable 'basename'."

[Walter Roberson]

Sorry, I have corrected it.

[Katie]

Wonderful. Huge appreciation.