MATRIX_ITERATE

Controls linear scaling iterative procedure on matrices: inversion, sqrti, etc. High-order Lanczos accelerates convergence provided it can estimate the eigenspectrum correctly. [Edit on GitHub]

Keywords

• EPS_LANCZOS

• EPS_TARGET_FACTOR

• MAX_ITER_LANCZOS

• ORDER_LANCZOS

Keyword descriptions

EPS_LANCZOS: real = 1.00000000E-003

Usage: EPS_LANCZOS 1.0E-4

Threshold for Lanczos eigenvalue estimation. [Edit on GitHub]

EPS_TARGET_FACTOR: real = 1.00000000E+001

Usage: EPS_TARGET_FACTOR 100.0

Multiplication factor that determines acceptable error in the iterative procedure. Acceptable error = EPS_TARGET_FACTOR * EPS_FILTER [Edit on GitHub]

MAX_ITER_LANCZOS: integer = 128

Usage: MAX_ITER_LANCZOS 64

Maximum number of Lanczos iterations. [Edit on GitHub]

ORDER_LANCZOS: integer = 3

Usage: ORDER_LANCZOS 5

Order of the Lanczos estimator. Use 0 to turn off. Do not use 1. [Edit on GitHub]