Matrix Polynomial Order#

Matrix polynomial order = <integer>

Description / Usage#

This optional card allows selection of polynomial order when a polynomial preconditioning option is selected (see the Preconditioner card). The input parameter is defined as:


Number of steps, k ( ≥ 0 ), to take when using matrix polynomial based preconditioners (Jacobi and symmetric Gauss-Seidel, for example).

If the Matrix polynomial order card is omitted, then the default selection is k=3.


Following is a sample card:

Matrix polynomial order = 4

Technical Discussion#

When used, the value of this parameter should be greater than 0, and probably no more than 10. In some, if not all, cases, a value of 0 is meaningless.

This card is not used if the preconditioner does not use matrix polynomials.