• using R version 2.14.0 RC (2011-10-24 r57417)
• using platform: i386-apple-darwin9.8.0 (32-bit)
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• this is package 'relations' version '0.6'
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  Packages suggested but not available for checking:
  'Rgraphviz' 'clue'
  
  Packages which this enhances but not available for checking:
  'seriation' 'Rcplex'
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  Package(s) unavailable to check Rd xrefs: 'clue'
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• checking examples ... WARNING
  checking a package with encoding 'UTF-8' in an ASCII locale
  
  ERROR
  Running examples in 'relations-Ex.R' failed
  The error most likely occurred in:
  
  > ### Name: reduction
  > ### Title: Transitive and Reflexive Reduction
  > ### Aliases: transitive_reduction reflexive_reduction reduction.relation
  > ### Keywords: math
  >
  > ### ** Examples
  >
  > R <- as.relation(1 : 5)
  > relation_incidence(R)
  Incidences:
  1L 2L 3L 4L 5L
  1L 1 1 1 1 1
  2L 0 1 1 1 1
  3L 0 0 1 1 1
  4L 0 0 0 1 1
  5L 0 0 0 0 1
  >
  > ## transitive closure/reduction
  > RR <- transitive_reduction(R)
  > relation_incidence(RR)
  Incidences:
  1L 2L 3L 4L 5L
  1L 1 1 0 0 0
  2L 0 1 1 0 0
  3L 0 0 1 1 0
  4L 0 0 0 1 1
  5L 0 0 0 0 1
  > R == transitive_closure(RR)
  [1] TRUE
  >
  > ## same
  > R == closure(reduction(R))
  [1] TRUE
  >
  > ## reflexive closure/reduction
  >
  > RR <- reflexive_reduction(R)
  > relation_incidence(RR)
  Incidences:
  1L 2L 3L 4L 5L
  1L 0 1 1 1 1
  2L 0 0 1 1 1
  3L 0 0 0 1 1
  4L 0 0 0 0 1
  5L 0 0 0 0 0
  > R == reflexive_closure(RR)
  [1] TRUE
  >
  > ## same:
  > R == closure(reduction(R, "reflexive"), "reflexive")
  [1] TRUE
  >
  > ## transitive reduction of a cyclic relation:
  > ## (example from La Poutre and van Leeuwen)
  >
  > G <- set(pair(1L, 2L), pair(2L, 1L), pair(1L, 3L), pair(3L, 1L),
  + pair(3L, 7L), pair(2L, 5L), pair(2L, 6L), pair(6L, 5L),
  + pair(5L, 7L), pair(4L, 6L), pair(5L, 4L), pair(4L, 7L))
  > R <- endorelation(graph = G)
  > plot(relation_ensemble(R, R), type = c("raw", "simplified"), main =
  + c("original graph", "transitive reduction"))
  Loading required package: Rgraphviz
  Warning in library(package, lib.loc = lib.loc, character.only = TRUE, logical.return = TRUE, :
  there is no package called 'Rgraphviz'
  Error in plot.relation_ensemble(relation_ensemble(R, R), type = c("raw", :
  Plotting requires package 'Rgraphviz'.
  Calls: plot -> plot.relation_ensemble
  Execution halted
• elapsed time (check, wall clock): 0:33