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

> ### Name: set_operations
> ### Title: Suite of set operations
> ### Aliases: set_operations maximal_sets minimal_sets remove_redundant
> ###   is_inset get_subset get_superset is_subsetof is.subsetof
> 
> ### ** Examples
> 
> 
> set <- list(c(1,2), c(1,2,3), c(2,3,6), c(2,4), c(5,6), 5)            
>                                                             
> el1 <- c(2,1)                                               
> el2 <- c(2,3)                                               
> el3 <- c(4,3)                                               
> el4 <- c(2,1,3)                                             
>                                                             
> maximal_sets(set)                                           
[[1]]
[1] 1 2 3

[[2]]
[1] 2 3 6

[[3]]
[1] 2 4

[[4]]
[1] 5 6

> minimal_sets(set)                                           
[[1]]
[1] 1 2

[[2]]
[1] 2 3 6

[[3]]
[1] 2 4

[[4]]
[1] 5

>                                                             
> remove_redundant(set)                                       
[[1]]
[1] 1 2 3

[[2]]
[1] 2 3 6

[[3]]
[1] 2 4

[[4]]
[1] 5 6

> remove_redundant(set, maximal=FALSE)                        
[[1]]
[1] 1 2

[[2]]
[1] 2 3 6

[[3]]
[1] 2 4

[[4]]
[1] 5

>                                                             
> is_inset(el1, set)                                          
[1] TRUE
> is_inset(el2, set)                                          
[1] TRUE
> is_inset(el3, set)                                          
[1] FALSE
>                                                             
> get_subset(el1, set)
[1] 1
> get_subset(el1, set)                                        
[1] 1
> get_subset(el2, set)                                        
integer(0)
> get_subset(el3, set)                                        
integer(0)
> 
> get_superset(el1, set)                                      
[1] 1
> get_superset(el1, set, all=TRUE)                                      
[1] 1 2
> get_superset(el2, set)                                      
[1] 2
> get_superset(el3, set)                                      
integer(0)
>                                                             
> is_subsetof(el1, el1)                                       
[1] TRUE
> is_subsetof(el1, el2)                                       
[1] FALSE
> is_subsetof(el1, el4)                                       
[1] TRUE
> 
> 
> 
> 
> ### * <FOOTER>
> ###
> cleanEx()