Lotka-Volterra 捕食者-猎物模型 by Juan Carlos Ponce Campuzano

GeoGebra 命令及参数

1. SolveODE(G, F, x(B), y(B), t, step) → solutioneq
2. Length(solutioneq) → npoints
3. First(solutioneq, npoints) → list0
4. Sequence(x(Element[list0, i]), i, 1, npoints) → list1
5. Sequence(y(Element[list0, i]), i, 1, npoints) → list2
6. Max(list1) → e
7. Max(list2) → g
8. Sequence(((4 * i / N), (2 * Element[list1, i] / f)), i, 1, N) → list3
9. Sequence(((4 * i / N), (2 * Element[list2, i] / h) + 3), i, 1, N) → list4
10. Vector(C, E) → u
11. Vector(C, D) → v
12. Sequence(Sequence[Vector[((10 * j / f), (10 * k / h)), ((10 * (j + (scale * F(j, k))) / f), (10 * (k + (scale * G(j, k))) / h))], j, 0, xmax, xstep], k, 0, ymax, ystep) → list5
13. Intersect(xAxis, yAxis) → I
14. Point(xAxis) → J
15. Point(yAxis) → K
16. Point(yAxis) → L
17. Point(yAxis) → M
18. Vector(I, J) → w
19. Vector(I, K) → i
20. Vector(L, M) → j
21. Vector(L, O) → k
22. PolyLine(list3) → l
23. PolyLine(list4) → m
24. Sequence(((10 * Element[list1, i] / f), (10 * Element[list2, i] / h)), i, 1, N) → list6
25. Segment(T, B') → n
26. Segment(S, B') → p
27. Segment(R, P) → q
28. Segment(P, Q) → r
29. Textfield(a) → InputBox1
30. Textfield(b) → InputBox2
31. Textfield(c) → InputBox3
32. Textfield(d) → InputBox4
33. Textfield(A_0) → InputBox5
34. Textfield(B_0) → InputBox6