Matrix RILU Relax Factor#
Matrix RILU relax factor = <float>
Description / Usage#
This optional card provides a relaxation factor to Aztec to be used in conjunction with preconditioners based on RILU(k,ω) approximate factorization. The input parameter <float> is defined as
fac, a floating point number ( fac ≥ 0 ) that specifies a relaxation factor.
If the Matrix RILU relax factor card is omitted, the default is 1.
Following is a sample card:
Matrix RILU relax factor = 0.5
Some limiting values for fac provide specific behavior:
for a value of zero, the ILU(k) is obtained
for a value of one, the MILU(k) is obtained.
The value of k is set by the Matrix graph fillin card.