Check if Update is Needed

DESCRIPTION:

This function is generic; method functions can be written to handle specific classes of objects. By default, it tries to extract a needUpdate attribute of object. If this is NULL or FALSE it returns FALSE; else it returns TRUE. 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:

needUpdate(object) 

REQUIRED ARGUMENTS:

object
any object

VALUE:

a logical value indicating whether object needs to be updated.

EXAMPLES:

vf1 <- varExp() 
vf1 <- initialize(vf1, data = Orthodont) 
needUpdate(vf1)