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Table 5 Values of m , k , and \(\pmb{\varepsilon_{k}}\) for Example 7.4 ( \(\pmb{{\mathscr{R} = 0.018685}}\) )

From: On the convergence of high-order Ehrlich-type iterative methods for approximating all zeros of a polynomial simultaneously

N

m

\(\boldsymbol{E_{f}(x^{(m)})}\)

\(\boldsymbol{\varepsilon_{m}}\)

k

\(\boldsymbol{\varepsilon_{k}}\)

\(\boldsymbol{\varepsilon_{k + 1}}\)

1

15

0.007235

1.588799 × 10−3

17

1.057241 × 10−18

1.574672 × 10−52

2

11

0.000001

1.731641 × 10−7

12

2.763909 × 10−30

2.863869 × 10−144

3

9

0.000026

4.171842 × 10−6

10

5.167701 × 10−32

2.328540 × 10−213

4

8

0.000032

5.141616 × 10−6

9

7.830010 × 10−40

3.487627 × 10−344

5

7

0.010766

2.954474 × 10−3

8

1.468181 × 10−20

2.870206 × 10−208

6

7

0.000002

4.201055 × 10−7

8

7.096655 × 10−71

6.481892 × 10−900

7

7

0.000000

9.445503 × 10−15

8

3.169914 × 10−196

2.445585 × 10−2,918

8

6

0.010675

2.911647 × 10−3

7

8.218559 × 10−31

3.538870 × 10−495

9

6

0.000281

4.462548 × 10−5

7

2.324176 × 10−64

1.205364 × 10−1,190

10

6

0.000000

1.231259 × 10−7

7

1.392265 × 10−124

1.840079 × 10−2,580

30

5

0.000000

2.416285 × 10−34

5

2.416285 × 10−34

1.294365 × 10−1,987