| isInitialized {nlme} | R Documentation | 
Checks if object has been initialized (generally through a call
to Initialize), by searching for components and attributes
which are modified during initialization.
isInitialized(object)
object | 
 any object requiring initialization.  | 
a logical value indicating whether object has been
initialized. 
Jose Pinheiro and Douglas Bates
pd1 <- pdDiag(~age) isInitialized(pd1)