class OutputVariable(Variable):
'''An output varible such as Health or Tip.
Defines a linguistic variable for output.
Attributes:
default: a float value to assume by default if there is no output.
defuzzifier: an instance of a defuzzifier method.
output: a Cumulative term to which Output terms will be appended.
'''
def __init__(self, name, default = None):
Variable.__init__(self, name)
self.default = default
self.defuzzifier = None
self.output = Cumulative('output')
def configure(self, fop):
Variable.configure(self, fop)
self.defuzzifier = fop.defuzzifier
self.output.accumulation = fop.accumulation
def defuzzify(self):
'''Returns a single float value representing the defuzzified output.'''
if self.output.is_empty():
return self.default
return self.defuzzifier.defuzzify(self.output)
def __init__(self, name, default = None):
Variable.__init__(self, name)
self.default = default
self.defuzzifier = None
self.output = Cumulative('output')