# EEQ

Parameters needed for EEQ method and solver [Edit on GitHub]

## Keywords

- ALPHA

- DIRECT

- EPS_DIIS

- MAX_DIIS

- MDIIS

- SDIIS

- SPARSE

## Keyword descriptions

ALPHA: real = 7.50000000E-001

  Usage: ALPHA 1.0

  Step length of initial steepest descent steps. [Edit on GitHub]

DIRECT: logical = F

  Lone keyword: `T`

  Usage: DIRECT

  Use a direct method to solve the EEQ equations in PBC (matrix solver) [Edit on GitHub]

EPS_DIIS: real = 1.00000000E-010

  Usage: EPS_DIIS 1.0E-10

  Accuracy for the iterative solver. [Edit on GitHub]

MAX_DIIS: integer = 500

  Usage: MAX_DIIS 100

  Max. number of iterations for EEQ solver. [Edit on GitHub]

MDIIS: integer = 12

  Usage: MDIIS 10

  Max. number of DIIS vectors used. [Edit on GitHub]

SDIIS: integer = 3

  Usage: SDIIS 4

  Number of vectors accumulated before starting DIIS. [Edit on GitHub]

SPARSE: logical = F

  Lone keyword: `T`

  Usage: SPARSE

  Use a sparse method to solve the EEQ equations. (NYA) [Edit on GitHub]