Package fuzzy :: Package set :: Module Trapez :: Class Trapez

[frames] | no frames]

Class Trapez

Realize a trapezoid-shaped fuzzy set:

          _____ _____  y_max
         /     \
        /|     |\
       / |     | \
      /  |     |  \
    _/   |     |   \_  y_min
     |   m1    m2  |
     |   |     |   |
    alpha|     |beta

See also http://pyfuzzy.sourceforge.net/demo/set/Trapez.png

Instance Methods

__init__(self, m1=-0.5, m2=0.5, alpha=0.5, beta=0.5, y_max=1.0, y_min=0.0)
Initialize a trapezoid-shaped fuzzy set.

source code

_update(self)
update polygon

source code

add(self, x, y, where=1)
Don't let anyone destroy our trapezoid.

source code

remove(self, x, where=1)
Don't let anyone destroy our trapezoid.

source code

clear(self)
Don't let anyone destroy our trapezoid.

source code

string

__repr__(self)
Return representation of instance.

source code

Inherited from Polygon.Polygon: __call__, getCOG, getValuesX, getValuesXY

Inherited from object: __delattr__, __format__, __getattribute__, __hash__, __new__, __reduce__, __reduce_ex__, __setattr__, __sizeof__, __str__, __subclasshook__

Class Variables

Inherited from Polygon.Polygon: BEGIN, END, X, Y

Properties

float y_max
y-value at top of the trapezoid

float y_min
y-value outside the trapezoid

float m1
x-value of left top of trapezoid

float m2
x-value of right top of trapezoid

float alpha
distance of left corner to m1

float beta
distance of right corner to m2

Inherited from Polygon.Polygon: points

Inherited from object: __class__

Method Details

init(self, m1=-0.5, m2=0.5, alpha=0.5, beta=0.5, y_max=1.0, y_min=0.0)
(Constructor)

Initialize a trapezoid-shaped fuzzy set.

Parameters:

y_max - y-value at top of the trapezoid (1.0)
y_min - y-value outside the trapezoid (0.0)
m1 - x-value of left top of trapezoid (-0.5)
m2 - x-value of right top of trapezoid (0.5)
alpha - distance of left corner to m1 (0.5)
beta - distance of right corner to m2 (0.5)

Overrides: object.__init__

add(self, x, y, where=1)

Don't let anyone destroy our trapezoid.

Overrides: Polygon.Polygon.add

remove(self, x, where=1)

Don't let anyone destroy our trapezoid.

Overrides: Polygon.Polygon.remove

clear(self)

Don't let anyone destroy our trapezoid.

Overrides: Polygon.Polygon.clear

repr(self)
(Representation operator)

Return representation of instance.

Returns: string: representation of instance
Overrides: object.__repr__

Property Details

y_max

y-value at top of the trapezoid

Get Method:: unreachable.fget(self)
Set Method:: unreachable.fset(self, value)
Type:: float

y_min

y-value outside the trapezoid

Get Method:: unreachable.fget(self)
Set Method:: unreachable.fset(self, value)
Type:: float

m1

x-value of left top of trapezoid

Get Method:: unreachable.fget(self)
Set Method:: unreachable.fset(self, value)
Type:: float

m2

x-value of right top of trapezoid

Get Method:: unreachable.fget(self)
Set Method:: unreachable.fset(self, value)
Type:: float

alpha

distance of left corner to m1

Get Method:: unreachable.fget(self)
Set Method:: unreachable.fset(self, value)
Type:: float

beta

distance of right corner to m2

Get Method:: unreachable.fget(self)
Set Method:: unreachable.fset(self, value)
Type:: float