CConstantMembershipFunction

通过坐标轴实施归属函数为平行直线的类。

描述

该函数通过下面方程式来描述：

y(x)=c

因此，函数归属度等于整个数值轴，也等于构造函数指定的参数。

绘制图表的示例代码显示如下。

声明

   class CConstantMembershipFuncion : public IMembershipFunction

主题

   #include <Math\Fuzzy\membershipfunction.mqh>

继承体系 CObject IMembershipFunction CConstantMembershipFunction

类方法

类方法	描述
GetValue	通过指定自变数计算归属函数值。

方法继承自类 CObject Prev, Prev, Next, Next, Save, Load, Type, Compare

示例

//+------------------------------------------------------------------+

//|                                   ConstantMembershipFunction.mq5 |

//|                        Copyright 2016, MetaQuotes Software Corp. |

//|                                             https://www.mql5.com |

//+------------------------------------------------------------------+

#include <Math\Fuzzy\membershipfunction.mqh>

#include <Graphics\Graphic.mqh>

//--- 创建归属函数

CConstantMembershipFunction func1(0.2);

CConstantMembershipFunction func2(0.5);

CConstantMembershipFunction func3(0.8);

//--- 创建归属函数包装程序

double ConstantMembershipFunction1(double x) { return(func1.GetValue(x)); }

double ConstantMembershipFunction2(double x) { return(func2.GetValue(x)); }

double ConstantMembershipFunction3(double x) { return(func3.GetValue(x)); }

//+------------------------------------------------------------------+

//| 脚本程序起始函数                                                   |

//+------------------------------------------------------------------+

void OnStart()

  {

//--- 创建图形

   CGraphic graphic;

   if(!graphic.Create(0,"ConstantMembershipFunction",0,30,30,780,380))

     {

      graphic.Attach(0,"ConstantMembershipFunction");

     }

   graphic.HistoryNameWidth(70);

   graphic.BackgroundMain("ConstantMembershipFunction");

   graphic.BackgroundMainSize(16);

//--- 创建曲线

   graphic.CurveAdd(ConstantMembershipFunction1,0.0,10.0,1.0,CURVE_LINES,"[0.2]");

   graphic.CurveAdd(ConstantMembershipFunction2,0.0,10.0,1.0,CURVE_LINES,"[0.5]");

   graphic.CurveAdd(ConstantMembershipFunction3,0.0,10.0,1.0,CURVE_LINES,"[0.8]");

//--- 设置X轴属性

   graphic.XAxis().AutoScale(false);

   graphic.XAxis().Min(0.0);

   graphic.XAxis().Max(10.0);

   graphic.XAxis().DefaultStep(1.0);

//--- 设置Y轴属性

   graphic.YAxis().AutoScale(false);

   graphic.YAxis().Min(0.0);

   graphic.YAxis().Max(1.1);

   graphic.YAxis().DefaultStep(0.2);

//--- 绘图

   graphic.CurvePlotAll();

   graphic.Update();

  }