Package fuzzy :: Package norm :: Module SchweizerIntersection2
Source Code for Module fuzzy.norm.SchweizerIntersection2

 1  # -*- coding: utf-8 -*- 
 2  # 
 3  # Copyright (C) 2009  Rene Liebscher 
 4  # 
 5  # This program is free software; you can redistribute it and/or modify it under 
 6  # the terms of the GNU Lesser General Public License as published by the Free  
 7  # Software Foundation; either version 3 of the License, or (at your option) any 
 8  # later version. 
 9  # 
10  # This program is distributed in the hope that it will be useful, but WITHOUT  
11  # ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS 
12  # FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more 
13  # details. 
14  #  
15  # You should have received a copy of the GNU Lesser General Public License 
16  # along with this program; if not, see <http://www.gnu.org/licenses/>.  
17  # 
18   
19  __revision__ = "$Id: SchweizerIntersection2.py,v 1.10 2010-01-21 20:55:51 rliebscher Exp $" 
20   
21  from fuzzy.norm.ParametricNorm import ParametricNorm 
22  from fuzzy.utils import inf_p 
23   
24 -class SchweizerIntersection2(ParametricNorm): 
25      """Schweizer,Sklar 1960""" 
26   
27      _range = [ (0.,inf_p) ] 
28   
29 -    def __init__(self, param=1.): 
30          super(SchweizerIntersection2, self).__init__(ParametricNorm.T_NORM, param) 
31   
32 -    def __call__(self, *args): 
33          x, y = self.checkArgs2(args) 
34          p = self.p 
35          if p > 0. and (x == 0. or y == 0.): 
36              return 0. 
37          def f(x,p): 
38              return 1./pow(x,p) 
39          return 1.0/pow(f(x,p)+f(y,p)-1.0,1.0/p) 
40