Table 4
Computational statistic of the propagation grids in several cases.
| Num. of cells (NB) (basic grid) | Num. of subcells | Num. of virtual points | Time of calculation | 〈χ2〉 | Rel. covering % | |
|---|---|---|---|---|---|---|
| Creation relative to t1 t1 = 0.617 s | Pack. prop. relative to t2 t2= 267.18 s | |||||
| Regular, see Fig. 6 | ||||||
| 103 | – | – | 0.001 | 0.150 | 3.87 | 15.3 |
| 503 | – | – | 0.1 | 0.380 | 1.03 | 63.5 |
| 1003 | – | – | 0.7 | 0.680 | 0.33 | 100.0 |
| 1503 | – | – | 1 | 1.00 | 0.15 | 100.0 |
| Octgrid | ||||||
| 103 | 3760 | 103 | 0.06 | 0.178 | 1.97 | 92.9 |
| 103 | 40768 | 104 | 0.3 | 0.256 | 0.61 | 100 |
| 103 | 404788 | 105 | 3 | 0.452 | 0.11 | 100 |
| 103 | 4223 624 | 106 | 231 | 0.908 | 0.06 | 100 |
| 503 | 424 | 103 | 1 | 0.396 | 1.02 | 100 |
| 503 | 18 496 | 104 | 6 | 0.401 | 0.68 | 100 |
| 503 | 328 720 | 105 | 60 | 0.484 | 0.17 | 100 |
| 503 | 899 904 | 106 | 770 | 0.897 | 0.06 | 100 |
| One-level subgrid | ||||||
| 103 | 965 | 103 | 0.03 | 0.174 | 2.23 | 100 |
| 103 | 45 956 | 104 | 0.2 | 0.289 | 0.45 | 100 |
| 103 | 1 631 479 | 105 | 10 | 0.809 | 0.07 | 100 |
| 103 | 54463 204 | 106 | 483 | 2.426 | 0.06 | 100 |
| 503 | 0 | 103 | 0.5 | 0.393 | 1.30 | 63.5 |
| 503 | 1400 | 104 | 5 | 0.403 | 0.98 | 100 |
| 503 | 149 804 | 105 | 47 | 0.443 | 0.15 | 100 |
| 503 | 6357 511 | 106 | 3767 | 1.002 | 0.04 | 100 |
| 1003 | 0 | 103 | 4 | 0.749 | 0.33 | 100 |
| 1003 | 8 | 104 | 38 | 0.750 | 0.33 | 100 |
| 1003 | 27 902 | 105 | 402 | 0.767 | 0.29 | 100 |
| 1003 | 1 907 557 | 106 | 3431 | 0.830 | 0.05 | 100 |
Notes. We show the number of cells in the basic grid (second column), the total number of subcells (if subgrids are present, third column), the relative CPU time needed for grid creation (fourth column) and the relative CPU time of the packet propagation (fifth column). The reference values are corresponding CPU times needed to create the regular grid 1503. For each grid the standard deviation 〈χ2〉Eq. (42) is shown. This quantity describes the quality of the modGrid cell covering.
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