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Table 2 Numerical results for Example 6.2

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 ) ′

19

0.0166

( − 0.3097 , − 0.1638 , 0.1067 ) ′

5

0.0264

( − 0.6409 , − 0.0027 , 0.3205 ) ′

( 1 , 1 , 1 ) ′

5

0.0155

( 0.3988 , 0.0763 , − 0.2023 ) ′

10

0.0271

( 0.1828 , 0.0493 , − 0.1644 ) ′

rand ( 3 , 1 ) ′ ∗10

7

0.0159

( 6.0095 , − 0.0363 , − 3.0054 ) ′

7

0.0280

( 3.7284 , 0.4046 , − 2.6730 ) ′