Null permutations
Null permutations are the equivalent of NULL
nullcycle nullword
Object nullcycle is an empty list coerced to class
cycle, specfically cycle(list())
Object nullword is a zero-row matrix, coerced to word,
specifically word(matrix(integer(0),0,0))
These objects are here to deal with the case where a length-zero permutation is extracted. The behaviour of these null objects is not entirely consistent.
The objects documented here are distinct from the identity
permutation, id, documented separately.
rperm(10,4)[0] # null word as.cycle(1:5)[0] # null cycle data(megaminx) c(NULL,megaminx) # probably not what the user intended... c(nullcycle,megaminx) # more useful. c(id,megaminx) # also useful.
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