This method function checks if any of the elements of
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.
## S3 method for class 'modelStruct' needUpdate(object)
an object inheriting from class
a logical value indicating whether any element of
to be updated.
José Pinheiro and Douglas Bates [email protected]
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