formula.nls              package:stats              R Documentation

Extract Model Formula from nls Object

Description:

     Returns the model used to fit 'object'.

Usage:

     ## S3 method for class 'nls':
     formula(x, ...)

Arguments:

       x: an object inheriting from class '"nls"', representing a
          nonlinear least squares fit.

     ...: further arguments passed to or from other methods.

Value:

     a formula representing the model used to obtain 'object'.

Author(s):

     Jose Pinheiro and Douglas Bates

See Also:

     'nls', 'formula'

Examples:

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

