fork download
  1. import numpy as np
  2. import matplotlib.pyplot as plt
  3.  
  4. # 係数
  5. a, b, c, d = 0.03, 0.00005, 0.0001, 0.05
  6.  
  7. # 初期値
  8. init_x = 1000
  9. init_y = 100
  10.  
  11. # 時間進行
  12. dt = 0.5
  13. n = 500
  14.  
  15. # 配列の初期化
  16. x = np.zeros(n)
  17. x[0] = init_x
  18. y = np.zeros(n)
  19. y[0] = init_y
  20.  
  21. for i in range(1, n):
  22. x[i] = (a - b * y[i - 1]) * x[i - 1] * dt + x[i - 1]
  23. y[i] = (c * x[i - 1] - d) * y[i - 1] * dt + y[i - 1]
  24. print(i, x[i], y[i])
  25.  
  26. t = np.arange(0, n * dt, dt)
  27.  
  28. plt.plot(t, x, label="Prey")
  29. plt.plot(t, y, label="Predator")
  30. plt.legend()
  31. plt.show()
  32.  
Success #stdin #stdout 0.71s 55752KB
stdin
Standard input is empty
stdout
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