Hello Lilya,
I'm guessing the problem is your header.405 is not the first file listed in dinfo. What you could do i find the position of your header file and set it to be the first.
Index = find(contains(filenames,'header')); % Find the position of the header file
F=[filenames(Index),filenames];
F(Index+1)=[];
output='merged.txt';
fidout=fopen(output,'w');
for cnt=1:length(F)
fprintf(fidout,'%s\n',F(cnt));
fidin=fopen(F(cnt));
fwrite(fidout,fread(fidin));
fprintf(fidout,'\n');
fclose(fidin);
end
fclose(fidout);
Hope this works!
