Create mapping for movement between strata due to vaccine waning

Create mapping for movement between strata due to vaccine waning

create_waning_map(n_vax, i_v, i_w, z)

Arguments

n_vax	Integer in (0, 5) denoting total number of strata
i_v	indices of strata being vaccinated
i_w	Integer in (0, 5) denoting which stratum receives waned vaccinees
z	Scalar denoting rate of waning

Value

an array of the mapping