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Source Code for Module fuzzy.Adjective

 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  """Describes a ... of a variable.""" 
19  __revision__ = "$Id: Adjective.py,v 1.16 2010-02-17 19:57:13 rliebscher Exp $" 
20   
21   
22  from fuzzy.norm.Max import Max 
23  from fuzzy.set.Set import Set 
24   
25 -class Adjective(object): 
26      """Describes a ... of a variable. 
27       
28      @ivar set: fuzzy set 
29      @type set: L{fuzzy.set.Set.Set} 
30      @ivar COM: norm (if None the class default _COM is used.) 
31      @type COM: L{fuzzy.norm.Norm.Norm} 
32      @ivar membership: set or calculated membership 
33      @type membership: float 
34      @cvar _COM: class default is instance variable is None 
35      @type _COM: L{fuzzy.norm.Norm.Norm} 
36      """ 
37   
38      # default if not set in instance 
39      _COM = Max() 
40      _set = Set() 
41   
42 -    def __init__(self, set=None, COM=None): 
43          """Initialize adjective. 
44           
45          @param set: fuzzy set 
46          @type set: L{fuzzy.set.Set.Set} 
47          @param COM: norm (if None the class default _COM is used.) 
48          @type COM: L{fuzzy.norm.Norm.Norm} 
49          """ 
50          self.set = set or Adjective._set 
51          self.membership = None 
52          self.COM = COM 
53   
54 -    def setMembershipForValue(self, value): 
55          """Get membership for an input value from the fuzzy set.""" 
56          self.membership = self.set(value) 
57   
58 -    def getMembership(self): 
59          """Return membership set in this adjective.""" 
60          if self.membership is None: 
61              return 0.0 
62          else: 
63              return self.membership 
64   
65 -    def setMembership(self, value): 
66          """Set membership of this adjective as result  
67             of a rule calculation,  
68             if already set use COM norm to merge 
69             old and new value.""" 
70   
71          if self.membership is None: 
72              self.membership = value 
73          else: 
74              self.membership = (self.COM or self._COM)( 
75                                                      self.membership,  # consider already set value 
76                                                      value 
77                                                  ) 
78   
79 -    def reset(self): 
80          """Reset membership to unknown value (None).""" 
81          self.membership = None 
82   
83 -    def getName(self, system): 
84          """Find own name in given system. 
85          Returns a tuple (var_name,adj_name) of None.""" 
86          return system.findAdjectiveName(self) 
87   
88 -    def __repr__(self): 
89          """Return representation of instance. 
90                      
91             @return: representation of instance 
92             @rtype: string 
93             """ 
94          params = [] 
95          if self.set is not Adjective._set: params.append("set=%s" % repr(self.set)) 
96          if self.COM: params.append("COM=%s" % repr(self.COM)) 
97          return "%s.%s(%s)" % (self.__class__.__module__, self.__class__.__name__, ", ".join(params)) 
98   

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