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Source Code for Module fuzzy.norm.Norm

  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      Abstract base class for any kind of fuzzy norm. 
 20  """ 
 21   
 22  __revision__ = "$Id: Norm.py,v 1.16 2010-02-17 19:45:00 rliebscher Exp $" 
 23   
 24  from fuzzy.Exception import FuzzyException 
 25 -class NormException(FuzzyException): 
 26      """Base class for any exception in norm calculations.""" 
 27      pass 
 28   
 29   
 30 -class Norm(object): 
 31      """Abstract Base class of any fuzzy norm""" 
 32   
 33      # types of norm 
 34      UNKNOWN = 0 #: type of norm unknown 
 35      T_NORM = 1 #: norm is t-norm 
 36      S_NORM = 2 #: norm is s-norm 
 37   
 38 -    def __init__(self, type=UNKNOWN): 
 39          """Initialize type of norm""" 
 40          self._type = type 
 41   
 42 -    def __call__(self, *args): 
 43          """ 
 44              Calculate result of norm(arg1,arg2,...) 
 45           
 46              @param args: list of floats as arguments for norm. 
 47              @type args: list of float 
 48              @return: result of norm calulation 
 49              @rtype: float 
 50              @raise NormException: any problem in calculation (wrong number of arguments, numerical problems) 
 51          """ 
 52          raise NotImplementedError("abstract class %s can't be called" % self.__class__.__name__) 
 53   
 54 -    def getType(self): 
 55          """ 
 56              Return type of norm: 
 57              0 = not defined or not classified 
 58              1 = t-norm ( = Norm.T_NORM) 
 59              2 = s-norm ( = Norm.S_NORM) 
 60   
 61          """ 
 62          return self._type 
 63       
 64 -    def checkArgs2(self, args): 
 65          """Checks args to be 2 float values. 
 66       
 67          @param args: list of arguments 
 68          @type args: list of float? 
 69          @return: first two args as float values 
 70          @rtype: (float,float) 
 71          """ 
 72          if len(args) != 2: 
 73              raise NormException("%s is supported only for 2 arguments" % self.__class__.__name__ ) 
 74          return float(args[0]), float(args[1]) 
 75   
 76 -    def checkArgsN(self, args): 
 77          """Checks args to be at least 2 float values. 
 78       
 79          @param args: list of arguments 
 80          @type args: list of float? 
 81          @return: arguments as float values 
 82          @rtype: list of float 
 83          """ 
 84          if len(args) < 2: 
 85              raise NormException("%s is supported only for more the 2 arguments" % self.__class__.__name__ ) 
 86          return [float(x) for x in args] 
 87   
 88 -    def __repr__(self): 
 89          """Return representation of instance. 
 90                      
 91             @return: representation of instance 
 92             @rtype: string 
 93             """ 
 94          return "%s.%s()" % (self.__class__.__module__, self.__class__.__name__) 
 95      
 96 -def product(*args): 
 97      """Calculate product of args. 
 98   
 99      @param args: list of floats to multiply 
100      @type args: list of float 
101      @return: product of args 
102      @rtype: float 
103      """ 
104      r = args[0] 
105      for x in args[1:]: 
106          r *= x 
107      return r 
108   
109   
110 -def sum(*args): 
111      """Calculate sum of args. 
112       
113      If using numpy the builtin sum doesn't work always! 
114   
115      @param args: list of floats to sum 
116      @type args: list of float 
117      @return: sum of args 
118      @rtype: float 
119      """ 
120      r = args[0] 
121      for x in args[1:]: 
122          r += x 
123      return r 
124   

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