Experimental: Returns a function of Emission Factor by age of use

ef_fun returns amount of vehicles at each age

ef_fun(
  ef,
  type = "logistic",
  x = 1:length(ef),
  x0 = mean(ef),
  k = 1/4,
  L = max(ef),
  verbose = TRUE
)

Arguments

ef: Numeric; numeric vector of emission factors.
type: Character; "logistic" by default so far.
x: Numeric; vector for ages of use.
x0: Numeric; the x-value of the sigmoid's midpoint,
k: Numeric; the steepness of the curve.
L: Integer; the curve's maximum value.
verbose: Logical; to show the equation.

Value

numeric vector.

References

https://en.wikipedia.org/wiki/Logistic_function

Examples

if (FALSE) { # \dontrun{
CO <- ef_cetesb(p = "CO", veh = "PC_G")
ef_logit <- ef_fun(ef = CO, x0 = 27, k = 0.4, L = max(CO))
df <- data.frame(CO, ef_logit)
colplot(df)
} # }