pastas.rfunc.FourParam.get_tmax_approximation
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.. py:method:: pastas.rfunc.FourParam.get_tmax_approximation(p: pastas.typing.ArrayLike, cutoff: float | None = None) -> float

   
   Approximate tmax using adaptive cumulative integration in log-time.

   :param p: Response function parameters `[A, n, a, b]`.
   :type p: array_like
   :param cutoff: Fraction of the total step response reached at tmax.
   :type cutoff: float, optional

   :returns: Approximated tmax in days.
   :rtype: float















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