needUpdate.modelStruct         package:nlme         R Documentation

Check if a modelStruct Object Needs Updating

Description:

     This method function checks if any of the elements of 'object'
     needs to be updated. Updating of objects usually takes place in
     iterative algorithms in which auxiliary quantities associated with
     the object, and not being optimized over, may change.

Usage:

     ## S3 method for class 'modelStruct':
     needUpdate(object)

Arguments:

  object: an object inheriting from class 'modelStruct', representing a
          list of model components, such as 'corStruct' and 'varFunc'
          objects.

Value:

     a logical value indicating whether any element of 'object' needs
     to be updated.

Author(s):

     Jose Pinheiro Jose.Pinheiro@pharma.novartis.com and Douglas Bates
     bates@stat.wisc.edu

Examples:

     lms1 <- lmeStruct(reStruct = reStruct(pdDiag(diag(2), ~age)),
        varStruct = varPower(form = ~age))
     needUpdate(lms1)

