Set up a function to compute the travel EIR
Arguments
- pars
a list
- travelEIR
the time spent traveling
- F_season
a function describing a seasonal pattern
- F_trend
a function describing a trend
- i
the host species index
Set up a function to compute the travel EIR
a list
the time spent traveling
a function describing a seasonal pattern
a function describing a trend
the host species index