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Table 3 Numerical results for Example 6.3

From: A preconditioning method of the CQ algorithm for solving an extended split feasibility problem

Starting point

The method (26)

The method (30)

k

CPU (s)

Approximate solution

k

CPU (s)

Approximate solution

( 1 , 2 , 3 ) ′

6

0.0156

( 1.4000 , 1.1864 , 1.6101 ) ′

8

0.0274

( − 0.0500 , 0.0480 , 0.0234 ) ′

( 1 , 1 , 1 ) ′

1

0.0149

( 1 , 1 , 1 ) ′

4

0.0269

( 0.3412 , 0.0403 , − 0.1714 ) ′

rand ( 3 , 1 ) ′ ∗10

7

0.0153

( 9.5717 , 1.0372 , 1.7101 ) ′

7

0.0273

( 0.9290 , − 0.2692 , − 0.5000 ) ′