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↓ ABCD schemes
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table of coefficients (about 18 digits) (.txt) ABC scheme, complex: AY 15-6 c
s=15, p=6; 7-fold symmetric Strang composition, analogous to AB:C 8-6 c (Auzinger 2015)
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composition weights (optimal choice same as in AB:C 8-6 c):
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ω1 = 0.186532492812133818 + 0.00310743071007267520 i
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ω2 = 0.129559101282088263 - 0.123989612188092593 i
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ω3 = 0.116900037554661284 + 0.0434282546160603418 i
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and ω0 = 1 - 2(ω1+ω2+ω3)
= 0.134016736702233270 + 0.154907853723919152 i
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LEM: 0.2
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i | ai | bi | ci |
1 |
0 |
0 |
ω3/2 |
2 |
0 |
ω3/2 |
0 |
3 |
ω3 |
ω3/2 |
(ω2+ω3)/2 |
4 |
0 |
ω2/2 |
0 |
5 |
ω2 |
ω2/2 |
(ω1+ω2)/2 |
6 |
0 |
ω1/2 |
0 |
7 |
ω1 |
ω1/2 |
(ω0+ω1)/2 |
8 |
0 |
ω0/2 |
0 |
9 |
ω0 |
ω0/2 |
(ω0+ω1)/2 |
10 |
0 |
ω1/2 |
0 |
11 |
ω1 |
ω1/2 |
(ω1+ω2)/2 |
12 |
0 |
ω2/2 |
0 |
13 |
ω2 |
ω2/2 |
(ω2+ω3)/2 |
14 |
0 |
ω3/2 |
0 |
15 |
ω3 |
ω3/2 |
ω3/2 |
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