MATLAB: How to add a column to a table based on each csv files name

Question

I want to write a bunch of csv files together and I am using the following code:

xx = table();
 CSVfileNames = dir('*.csv');
 for kk = 1:numel(CSVfileNames)
     x0 = readtable(CSVfileNames(kk).name);
     xx = [xx; x0];
     oo=table2array(xx)
    xlswrite('AllCSV',oo)
 end

However, within the file I would like an additional column which has the csv file name.

So for example, the first 10 rows would be named the first csv file, the next 10 rows would be the next csv file name etc.

I tried

xx = addvars(xx,CSVfileNames,'Before','Var1');

– but this didnt work.

I am very new to Matlab so please bear with me! I found this code online and have adapted.

Answer 1

filename = CSVfileNames(kk).name;
x0 = readtable(filename);
x0 = addvars(x0, repmat({filename}, height(x0), 1), 'Before', 'Var1', 'NewVariableNames', 'filename');