read_dynmat_adv

esta.qeBag.read_dynmat_adv

read_dynamical_matrix_q0(filename, natm_type, posfile=None)

read dyanmatrix at q=(0 0 0) point to find the force constant between atoms as well as corresponding distance between atoms

parameters:

filename: string 
            name of the dynamical martrix file

natm_type: list
            for no. of atoms of each types; e.g. [4, 4, 14] for 
            3type of atoms 
posfile: str
            name of the poscar file, optional

returns:

NOTE: lattice is cubic see .f90 file in qe code:

e.g see: SUBROUTINE write_old_dyn_mat_head(iudyn) in io_dyn_mat_old.f90 or other .f90 files ....