This function is used in iterative NMF algorithms to
manage variables stored in a local workspace, that are
accessible to all functions that define the iterative
schema described in
NMFStrategyIterative-class.
It is specially useful for computing stopping criteria, which often require model data from different iterations.
staticVar(name, value, init = FALSE)
value is
provided, that specifies if the variable should be set to
the new value only if it does not exist yet
(init=TRUE).The value of the static variable