get_index_from_threshold
===================================================================

.. py:function:: petpal.kinetic_modeling.graphical_analysis.get_index_from_threshold(times_in_minutes: numpy.ndarray, t_thresh_in_minutes: float) -> int

   Get the index after which all times are greater than the threshold.

   :param times_in_minutes: Array containing times in minutes.
   :type times_in_minutes: np.ndarray
   :param t_thresh_in_minutes: Threshold time in minutes.
   :type t_thresh_in_minutes: float

   :returns: *int* -- Index for first time greater than or equal to the threshold time.

   .. rubric:: Notes

   If the threshold value is larger than the array, we return -1.