if (FALSE) {
setMethod("eigen", signature(x = "dgeMatrix", only.values = "missing"),
          function(x, symmetric, only.values, EISPACK) # << must match generic
          .Call(dgeMatrix_eigen, x, FALSE))

setMethod("eigen", signature(x = "dgeMatrix", only.values = "logical"),
          function(x, symmetric, only.values, EISPACK)
          .Call(dgeMatrix_eigen, x, only.values))
} #not yet

setMethod("Schur", signature(x = "dgeMatrix", vectors = "missing"),
          function(x, vectors, ...)
          .Call(dgeMatrix_Schur, x, TRUE))

setMethod("Schur", signature(x = "dgeMatrix", vectors = "logical"),
          function(x, vectors, ...)
          .Call(dgeMatrix_Schur, x, vectors))