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Table 2 Results for Example 5.4 using Qu and Xiu method in [7]

From: Gradient projection method with a new step size for the split feasibility problem

Starting points \(x_{0}\)

Number of iterations

CPU (s)

Approximate solution \(x^{*}\)

Approximate of \(c(x^{*})\)

Approximate of \(q(Ax^{*})\)

\((1,2,3,0,0,0)^{T}\)

1890

2.7740

\((-0.1203,0.0285,0.0582)^{T}\)

−0.00308775

−0.0152279

\((1,1,1,1,1,1)^{T}\)

2978

4.2860

\((0.8603,-0.1658,-0.5073)^{T}\)

−0.12681

1.08162

\((1,2,3,4,5,6)^{T}\)

3317

4.8570

\((3.6522,-0.1526,-2.3719)^{T}\)

−1.06831

15.5579