permutations (version 1.1-9-1)

megaminx_superflip: The Megaminx Superflip

Description

On the megaminx, a flip is a a sequence of moves whose only effect is to flip one or more edge pieces in place (the number of edges flipped must be even). The superflip is the operation that flips each of the 30 edges of the puzzle.

Object edge_facets is a 30 row, two-column matrix with each row representing an edge facet.

Usage

is.flip_pair(pair)
is.flip(p)
is.flip(p)
is.superflip(p)

Value

Returns a boolean vector

Arguments

pair

Integer vector of length two corresponding to a pair of facets

p

Vector iof permutations, coerced to cycle form

Author

Robin K. S. Hankin

See Also

megaminx

Examples

stopifnot(all(
 is.flip_pair(c(10,46)),
 is.flip_pair(c(98,124)),
!is.flip_pair(c(10,98)),
!is.flip_pair(c(11,98))
))

is.flip(c(
    as.cycle("(10,46)(44,50)(56,62)"),
    as.cycle("74,121)"),
    as.cycle("74,120)")
))