A function F_habitat_weights computes TiSp_frac_searching and
this function sets TiSp_frac_here.
Usage
habitat_dynamics(t, y, xds_obj)
Arguments
t
current time
y
state variables
xds_obj
an xds object
Value
an xds object
Note
The quantity TiSp_frac_here is part of the ML_interface
It is used to compute the Time at Risk matrix, and it is also
used to weight local exposure vs. searching exposure.