| Covariate {nlme} | R Documentation | 
This function is generic; method functions can be written to handle
specific classes of objects. Classes which already have methods for
this function include all varFunc classes.
covariate(object) <- value
object | 
 any object with a   | 
value | 
 a value to be assigned to the covariate associated with
  | 
will depend on the method function; see the appropriate documentation.
Jose Pinheiro and Douglas Bates bates@stat.wisc.edu
## see the method function documentation