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#### The "mother" of all  Matrix factorizations

## use a "fits all" bail-out method -- eventually this should not happen anymore
setMethod("expand", "MatrixFactorization",
          function(x, ...) .bail.out.1(.Generic, class(x)))

setMethod("show", "MatrixFactorization",
      function(object) { ## cheap one -- can have better for sub-classes
          cl <- class(object)
          cat(sprintf("'MatrixFactorization' of class \"%s\"\n", cl))
          str(object)
          })