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Source Code for Module fuzzy.Variable

 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  """Base class for any kind of fuzzy variable.""" 
19  __revision__ = "$Id: Variable.py,v 1.16 2010-02-17 19:57:13 rliebscher Exp $" 
20   
21   
22 -class Variable(object): 
23      """Base class for any kind of fuzzy variable. 
24         Returns as output the previous input value. 
25          
26         @ivar description: Description of the fuzzy variable 
27         @type description: string 
28         @ivar min: minimum value (not strictly enforced, but useful for some external tools) 
29         @type min: float 
30         @ivar max: maximum value (not strictly enforced, but useful for some external tools) 
31         @type max: float 
32         @ivar unit: Unit of the values 
33         @type unit: string 
34         """ 
35   
36 -    def __init__(self, description='', min=0., max=1., unit='', adjectives = None): 
37          """ 
38              @param description: Description of the fuzzy variable 
39              @type description: string 
40              @param min: minimum value (not strictly enforced, but useful for some external tools) 
41              @type min: float 
42              @param max: maximum value (not strictly enforced, but useful for some external tools) 
43              @type max: float 
44              @param unit: Unit of the values 
45              @type unit: string 
46          """ 
47          self.adjectives = adjectives or {} 
48          self.__value     = None 
49          self.description = description 
50          self.min         = min 
51          self.max         = max 
52          self.unit        = unit 
53   
54 -    def setValue(self, value): 
55          """Just store the value.""" 
56          self.__value = value 
57   
58 -    def getValue(self): 
59          """Return previous input value.""" 
60          return self.__value 
61   
62 -    def reset(self): 
63          """Reset meberships of adjectives for new calculation step.""" 
64          for adjective in self.adjectives.values(): 
65              adjective.reset() 
66   
67 -    def getName(self, system): 
68          """Lookup the name given this variable in the given system""" 
69          return system.findVariableName(self) 
70       
71 -    def __repr__(self): 
72          """Return representation of instance. 
73                      
74             @return: representation of instance 
75             @rtype: string 
76             """ 
77          params = [] 
78          self._repr_params(params) 
79          return "%s.%s(%s)" % (self.__class__.__module__, self.__class__.__name__, ", ".join(params)) 
80   
81 -    def _repr_params(self, params): 
82          """Helper for representation of instance. 
83           
84          Add all own params to given list in params.     
85          """ 
86          if self.description: params.append("description=%s" % repr(self.description)) 
87          if self.min != 0.: params.append("min=%s" % self.min) 
88          if self.max != 1.: params.append("max=%s" % self.max) 
89          if self.unit: params.append("unit=%s" % repr(self.unit)) 
90          if self.adjectives: params.append("adjectives=%s" % repr(self.adjectives)) 
91   

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