MQL5 ReferenceStandard LibraryMathematicsFuzzy LogicMembership functionsCCompositeMembershipFunction

CCompositeMembershipFunction

Class for implementing a composition of membership functions.

Description

Composition of membership functions is a combination of two or more membership functions using a specified operator.

fuzzy_composite_function

A sample code for plotting a chart is displayed below.

Declaration

class CCompositeMembershipFuncion : public IMembershipFunction

Title

#include <Math\Fuzzy\membershipfunction.mqh>

Inheritance hierarchy

CObject

IMembershipFunction

CCompositeMembershipFunction

Class methods

Class method	Description
CompositionType	Sets the composition operator.
MembershipFunctions	Gets the list of membership functions.
GetValue	Calculates the value of the membership function by a specified argument.

Methods inherited from class CObject

Prev, Prev, Next, Next, Save, Load, Type, Compare

Example

//+------------------------------------------------------------------+
//|                                  CompositeMembershipFunction.mq5 |
//|                         Copyright 2000-2024, MetaQuotes Ltd. |
//|                                             https://www.mql5.com |
//+------------------------------------------------------------------+
#include <Math\Fuzzy\membershipfunction.mqh>
#include <Graphics\Graphic.mqh>
//--- Create membership functions
CProductTwoSigmoidalMembershipFunctions func1(2,1,-1,7);
CP_ShapedMembershipFunction func2(0,6,7,9);
CCompositeMembershipFunction composite(ProdMF,GetPointer(func1),GetPointer(func2));
//--- Create wrappers for membership functions
double ProductTwoSigmoidalMembershipFunctions(double x) { return(func1.GetValue(x)); }
double P_ShapedMembershipFunction(double x) { return(func2.GetValue(x)); }
double CompositeMembershipFunction(double x) { return(composite.GetValue(x)); }
//+------------------------------------------------------------------+
//| Script program start function                                    |
//+------------------------------------------------------------------+
void OnStart()
  {
//--- create graphic
   CGraphic graphic;
   if(!graphic.Create(0,"CompositeMembershipFunction",0,30,30,780,380))
     {
      graphic.Attach(0,"CompositeMembershipFunction");
     }
   graphic.HistoryNameWidth(70);
   graphic.BackgroundMain("CompositeMembershipFunction");
   graphic.BackgroundMainSize(16);
//--- create curve
   graphic.CurveAdd(P_ShapedMembershipFunction,0.0,10.0,0.1,CURVE_LINES,"Func1");
   graphic.CurveAdd(ProductTwoSigmoidalMembershipFunctions,0.0,10.0,0.1,CURVE_LINES,"Func2");
   graphic.CurveAdd(CompositeMembershipFunction,0.0,10.0,0.1,CURVE_LINES,"Func1 * Func2");
//--- sets the X-axis properties
   graphic.XAxis().AutoScale(false);
   graphic.XAxis().Min(0.0);
   graphic.XAxis().Max(10.0);
   graphic.XAxis().DefaultStep(1.0);
//--- sets the Y-axis properties
   graphic.YAxis().AutoScale(false);
   graphic.YAxis().Min(0.0);
   graphic.YAxis().Max(1.1);
   graphic.YAxis().DefaultStep(0.2);
//--- plot
   graphic.CurvePlotAll();
   graphic.Update();
  }

GetValue

CompositionType