R: Extract Model Formula from nls Object

Extract Model Formula from nls Object

formula(object)

object an object inheriting from class nls, representing a non-linear least squares fit.

Returns the model used to fit object.

a formula representing the model used to obtain object.

Jose Pinheiro and Douglas Bates

data(Orange)
fm1 <- nls(circumference ~ A/(1+exp((B-age)/C)), Orange,
  start = list(A=160, B=700, C = 350))
formula(fm1)