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Table 4 Values of m , k , and \(\pmb{\varepsilon_{k}}\) for Example 7.3 ( \(\pmb{{\mathscr{R} = 0.033867}}\) )

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

18

0.000060

6.095859 × 10−5

20

1.620028 × 10−38

4.276235 × 10−114

2

12

0.015335

2.153155 × 10−2

14

1.095084 × 10−46

1.779476 × 10−230

3

10

0.018005

2.769333 × 10−2

12

8.917532 × 10−86

4.482714 × 10−596

4

9

0.005514

6.130790 × 10−3

10

4.221856 × 10−21

7.250879 × 10−184

5

9

0.000000

1.159694 × 10−15

10

5.021359 × 10−165

5.118016 × 10−1,808

6

8

0.000237

2.386016 × 10−4

9

8.455240 × 10−48

1.280870 × 10−612

7

8

0.000000

2.723047 × 10−17

8

2.723047 × 10−17

8.926059 × 10−249

8

7

0.018995

2.934241 × 10−2

8

2.885374 × 10−30

4.152134 × 10−503

9

7

0.002180

2.274734 × 10−3

8

3.792876 × 10−51

1.140751 × 10−958

10

7

0.000000

5.185525 × 10−7

8

1.620086 × 10−132

2.936276 × 10−2,768

30

5

0.000181

1.821419 × 10−4

6

1.395923 × 10−226

1.902920 × 10−13,777