The functions or variables listed here are no longer part of R as they are not needed (any more).
# Defunct in 1.3.0
dotplot(…)
stripplot(…)# Defunct in 1.6.0
piechart(x, labels = names(x), edges = 200, radius = 0.8,
         density = NULL, angle = 45, col = NULL, main = NULL, …)
dotplot and stripplot have been renamed to
  dotchart and stripchart,
  respectively.  The names are now used in lattice.
piechart was the old name for pie, but clashed with usage
  in Trellis (not implemented in lattice).