Structure Preprocessing Method for the System of Unclosed Linear Algebraic Equations

Table 1

Preprocessing time.

Steps	QMRGCGS2 (s)	CGS2 (s)	CGS (s)
100	15.36	20.36	22.36
200	20.30	23.34	27.14
300	25.47	27.56	32.25
400	28.36	30.21	38.17
500	34.23	35.14	45.20
600	38.11	40.12	50.31
700	42.36	45.21	58.74
800	45.10	48.25	66.62
900	48.51	55.36	70.36
1000	52.36	60.47	76.00