lambert_secant2

lambert_secant2
  Use the secant method to search for a root of the lambert function.

  F(0) = -5
  F(2) = 9.77811
2: Estimated convergence rate = 3.14502
3: Estimated convergence rate = -0.199504
4: Estimated convergence rate = -2.97175
5: Estimated convergence rate = 2.4385
6: Estimated convergence rate = 1.03317
7: Estimated convergence rate = 1.8679
8: Estimated convergence rate = 1.57628

  After 8 iterations:
  F(1.32672) = -3.32852e-10

  it <= itmax?  true
  |a-b| <= xtol?  true
  |f(b)| <= ftol?  true
diary quadratic_secant2.txt