nrc.fuzzy
Class TrapezoidFuzzySet

java.lang.Object
  |
  +--nrc.fuzzy.FuzzySet
        |
        +--nrc.fuzzy.LRFuzzySet
              |
              +--nrc.fuzzy.TrapezoidFuzzySet

All Implemented Interfaces:

java.lang.Cloneable, java.io.Serializable

Direct Known Subclasses:

RectangleFuzzySet, TriangleFuzzySet

public class TrapezoidFuzzySet

extends LRFuzzySet

implements java.io.Serializable

Used to build specialized FuzzySets that have a trapezoid shape. The diagram below shows a TrapezoidFuzzySet.



Note that the Constructors have been defined to make the generation of such curves as simple as possible. Only 4 points are required to define the trapezoid shape.

This is a specialization of the LRFuzzySet where the left and right shapes of the curve are linear.

See Also:

FuzzySet, LRFuzzySet, TriangleFuzzySet, LeftLinearFunction, RightLinearFunction, Serialized Form

Nested Class Summary

Nested classes inherited from class nrc.fuzzy.FuzzySet

FuzzySet.UITools

Field Summary

Fields inherited from class nrc.fuzzy.FuzzySet

BFALSE, BTRUE, COLLINEAR_OR_PARALLEL, INCREMENT, INTERSECTION, MAX_INITIAL_POINTS, MAXMIN, NO_INTERSECTION, numPoints, set, simplified, SUM, tool, toStringPrecision, UNION

Constructor Summary

TrapezoidFuzzySet(double zeroLeftX, double oneLeftX, double oneRightX, double zeroRightX)
Generate a FuzzySet with an trapeziod shape.

Methods inherited from class nrc.fuzzy.LRFuzzySet

checkParameters

Methods inherited from class nrc.fuzzy.FuzzySet

appendSetPoint, appendSetPoint, checkXValueOrder, checkYValueRange, concat, concat, confineToXBounds, copyFuzzySet, equals, findMaxYOverlapValue, fuzzyComplement, fuzzyEqual, fuzzyIntersection, fuzzyIntersection, fuzzyIntersectionUnion, fuzzyNormalize, fuzzyScale, fuzzySum, fuzzySum, fuzzyUnion, fuzzyUnion, getAlphaCut, getMaxY, getMembership, getMinY, getPoint, getSupport, getUITools, getX, getXforMembership, getY, goingDown, goingUp, horizontalIntersection, horizontalIntersectionUnion, horizontalUnion, incrementArrayLength, incrementArrayLength, insertSetPoint, insertSetPoint, isConvex, isEmpty, isNormal, isSimplified, maximumDefuzzify, maximumOfIntersection, maximumOfIntersection, momentDefuzzify, noIntersectionTest, nonIntersectionTest, plotFuzzySet, plotFuzzySets, removeSetPoint, removeSetPoint, sameDirection, sameSign, setToStringPrecision, shiftArrayLeft, shiftArrayRight, simplifySet, size, testArrayLength, toString, trimToSize, weightedAverageDefuzzify

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Detail

TrapezoidFuzzySet

public TrapezoidFuzzySet(double zeroLeftX,
                         double oneLeftX,
                         double oneRightX,
                         double zeroRightX)
                  throws XValuesOutOfOrderException

Generate a FuzzySet with an trapeziod shape.

Parameters:

zeroLeftX - the start of the curve at the left with a membership value of 0

oneLeftX - the end of the left upwards sloping line with a membership value of 1

oneRightX - the start of the right downwards sloping line with a membership value of 1

zeroRightX - the end of the right downwards sloping line with a membership value of 0

Throws:

XValuesOutOfOrderException - if the x values are not in correct increasing order