# The D.out output file

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## Purpose

- This file contains the dynamical matrices at different k points.

## File format

- It has
`3 * N_basis * N_kpoints`

rows and`6 * N_basis`

columns, where`N_basis`

is the number of basis atoms in the unit cell define in the basis.in file and`N_kpoints`

is the number of k points in the kpoints.in file. - Each consecutive
`3 * N_basis`

rows correspond to one k point. For each k point, the first`3 * N_basis`

columns correspond to the real part and the second`3 * N_basis`

columns correspond to the imaginary part. Schematically, the file is organized as:

D_real(k_0) D_imag(k_0) D_real(k_1) D_imag(k_1) ...

- The matrix elements are in units of eV A
^{-2}amu^{-1}.