sgn {permutations} | R Documentation |
Sign of a permutation
Description
The sign of a permutation is \pm 1
depending on whether it
is even or odd
Usage
sgn(x)
is.even(x)
is.odd(x)
Arguments
x |
permutation object |
Details
Coerces to cycle form
Author(s)
Robin K. S. Hankin
See Also
Examples
sgn(id) # always problematic
sgn(rperm(10,5))
x <- rperm(40,6)
y <- rperm(40,6)
stopifnot(all(sgn(x*y) == sgn(x)*sgn(y))) # sgn() is a homomorphism
z <- as.cycle(rperm(20,9,5))
z[is.even(z)]
z[is.odd(z)]
[Package permutations version 1.1-2 Index]