DataSets can be extended with R--objects (e.g. vectors,
matrices, arrays) if the following conditions are met:
extendDataSet(.Object, dims)
"extendDataSet"(.Object, dims)
"c"(x, ..., recursive = FALSE)DataSet;c.c.c) and
matrices (rbind, cbind). Also the lower--level S4--method
extendDataSet can be used to extend existing DataSet
objects.