Creates a formula which describe evolution of RNA concentration

This implements the non-standard evaluation version of the grow function.

grow_(x, mu, d, t)

Arguments

x	initial concentration.
mu	new steady-state level.
d	a degradation rate.
t	a longitude of the modelled period.

Value

an expression for the calculation of the RNA level.

Examples

x <- amount("a")
grow_(x,b,c,d)
#> b - (b - a) * exp(-c * d)
# b - (b - a) * exp(-c * d)