Running examples in 'relations-Ex.R' failed
The error most likely occurred in:

> ### Name: SVMBench
> ### Title: SVM Benchmarking Data and Consensus Relations
> ### Aliases: SVM_Benchmarking_Classification SVM_Benchmarking_Regression
> ###   SVM_Benchmarking_Classification_Consensus
> ###   SVM_Benchmarking_Regression_Consensus
> ### Keywords: datasets
> 
> ### ** Examples
> 
> data("SVM_Benchmarking_Classification")
> 
> ## 21 data sets
> names(SVM_Benchmarking_Classification)
 [1] "BreastCancer"        "Cards"               "Circle"             
 [4] "Heart1"              "HouseVotes84"        "Ionosphere"         
 [7] "PimaIndiansDiabetes" "Sonar"               "Spirals"            
[10] "chess"               "credit"              "hepatitis"          
[13] "liver"               "monks3"              "musk"               
[16] "promotergene"        "ringnorm"            "threenorm"          
[19] "tictactoe"           "titanic"             "twonorm"            
> 
> ## 17 methods
> relation_domain(SVM_Benchmarking_Classification)
Relation domain:
A pair with elements:
{"bagging", "dbagging", "fda.bruto", "fda.mars", "glm", "knn", "lda",
 "lvq", "mart", "mda.bruto", "mda.mars", "multinom", "nnet", "qda",
 "randomForest", "rpart", "svm"}
{"bagging", "dbagging", "fda.bruto", "fda.mars", "glm", "knn", "lda",
 "lvq", "mart", "mda.bruto", "mda.mars", "multinom", "nnet", "qda",
 "randomForest", "rpart", "svm"}
> 
> ## select weak orders
> weak_orders <-
+     Filter(relation_is_weak_order, SVM_Benchmarking_Classification)
> 
> ## only the artifical data sets yield weak orders
> names(weak_orders)
[1] "Circle"   "Spirals"  "ringnorm"
> 
> ## visualize them using Hasse diagrams
> if(require("Rgraphviz")) plot(weak_orders)
Loading required package: Rgraphviz
Loading required package: graph
Loading required package: BiocGenerics
Loading required package: parallel

Attaching package: 'BiocGenerics'

The following objects are masked from 'package:parallel':

    clusterApply, clusterApplyLB, clusterCall, clusterEvalQ,
    clusterExport, clusterMap, parApply, parCapply, parLapply,
    parLapplyLB, parRapply, parSapply, parSapplyLB

The following objects are masked from 'package:stats':

    IQR, mad, sd, var, xtabs

The following objects are masked from 'package:base':

    Filter, Find, Map, Position, Reduce, anyDuplicated, append,
    as.data.frame, basename, cbind, colnames, dirname, do.call,
    duplicated, eval, evalq, get, grep, grepl, intersect, is.unsorted,
    lapply, mapply, match, mget, order, paste, pmax, pmax.int, pmin,
    pmin.int, rank, rbind, rownames, sapply, setdiff, sort, table,
    tapply, union, unique, unsplit, which, which.max, which.min

Loading required package: grid
Warning: multiple methods tables found for 'plot'
Error in as.double(y) : 
  cannot coerce type 'S4' to vector of type 'double'
Calls: plot ... <Anonymous> -> <Anonymous> -> plot.default -> xy.coords
Execution halted