files=dir('test*.txt');
output='data.txt';
fidout=fopen(output,'w');
for cnt=1:length(files)
fprintf(fidout,'%s\n',files(cnt).name);
fidin=fopen(files(cnt).name);
fwrite(fidout,fread(fidin));
fprintf(fidout,'\n');
fclose(fidin);
end
fclose(fidout);
will merge the files and add the file names. What do you mean with a separate variable that shows the headers? If you want to store the headers in a variable, you can preallocate the headers before the loop:
headers=cell(size(files));
then save the first line of each file if there are letters:
fidin=fopen(files(cnt).name); %until here as in the upper code
first_line=fgets(fidin);
if any(isstrprop(first_line,'alpha'))
headers{cnt}=first_line;
end
fwrite(fidout,first_line);
fwrite(fidout,fread(fidin)); %continue with the upper code
