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#!/usr/bin/python -Wall
# ================================================================
# Please see LICENSE.txt in the same directory as this file.
# John Kerl
# kerl.john.r@gmail.com
# 2007-05-31
# ================================================================
# Group module for alternating permutations A_n, using cycle-decomposition I/O.
import pmtc_tm
import sackint
def get_elements(n):
sn_size = sackint.factorial(n)
elts = []
for k in range(0, sn_size):
elt = pmtc_tm.kth_pmtc(k, n, sn_size)
if (elt.parity() == 0):
elts.append(elt)
pmtc_tm.sort_pmtcs(elts)
return elts
def get_elements_str(params_string):
n = pmtc_tm.params_from_string(params_string)
return get_elements(n)
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