Hello,<br><br>I have a very large system and I must do a phonon
calculation. This calculation takes months, so I want to do with only
few atoms. But the variable nat_todo seems to not work. When I enable
the variable for a little system, it only makes the calculation ph.x to
the atoms that I ask, but with my system of interest, no matter if I
insert nat_todo, nrapp or maxirr, it continues making 3*n
representations.<br><br>Thanks very much!<br>