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

Type: real
Default: 1.00000000E-003
Usage: EPS_LANCZOS 1.0E-4

Description: Threshold for Lanczos eigenvalue estimation.

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EPS_TARGET_FACTOR

Type: real
Default: 1.00000000E+001
Usage: EPS_TARGET_FACTOR 100.0

Description: Multiplication factor that determines acceptable error in the iterative procedure. Acceptable error = EPS_TARGET_FACTOR * EPS_FILTER

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MAX_ITER_LANCZOS

Type: integer
Default: 128
Usage: MAX_ITER_LANCZOS 64

Description: Maximum number of Lanczos iterations.

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ORDER_LANCZOS

Type: integer
Default: 3
Usage: ORDER_LANCZOS 5

Description: Order of the Lanczos estimator. Use 0 to turn off. Do not use 1.

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