[求助]mt4指标，公式里的x值怎么改，谢谢 - 公式模型编写问题提交 - 金字塔客服中心 - 专业程序化交易软件提供商

//+------------------------------------------------------------------+
//|                                                       1111.mq4 |
//|                      Copyright ?2011, MetaQuotes Software Corp. |
//|                                       http://www.metaquotes.net |
//+------------------------------------------------------------------+
#property copyright "Copyright ?2011, MetaQuotes Software Corp."
#property link    "http://www.metaquotes.net"

#property indicator_separate_window

#property indicator_buffers 1
#property indicator_color1 Red

extern int MaxPer = 500;    //Maximal period analysed
extern int MinPer = 1;       //Minimal period analysed
extern int bar2update = 1; //Nombre de barres entre chaque update

double FlatBuf[];  //Flattened close price buffer

int LastUpdate=0;
string ShName="";

//+------------------------------------------------------------------+
//| Custom indicator initialization function                      |
//+------------------------------------------------------------------+
int init()
  {
//---- indicators
SetIndexStyle(0,DRAW_LINE);
SetIndexBuffer(0,FlatBuf);
//Correct if needed MinPer and MaxPer
  if(MinPer<2) MinPer=2;
  if(MaxPer<MinPer) MaxPer=MinPer;
  //Correct if needed Bar2Update
  if(bar2update<0) bar2update=1;

//---- name for DataWindow and indicator subwindow label
ShName=" 1111("+MinPer+" to "+MaxPer+" Periods)";
IndicatorShortName(ShName);
//----
return(0);
  }
//+------------------------------------------------------------------+
//| Custom indicator deinitialization function                      |
//+------------------------------------------------------------------+
int deinit()
  {
//----

//----
return(0);
  }
//+------------------------------------------------------------------+
//| Custom indicator iteration function                            |
//+------------------------------------------------------------------+
int start()
  {

//Check Enough Bars
if(Bars<3*MaxPer)
{
   Print(" Not Enough bars! - you need 3*MaxPer -> " + DoubleToStr(3*MaxPer,0));
   return(0);
}
else
   IndicatorShortName(ShName);

//Check bar2update
if(bar2update<1) bar2update=1;
//Check Update needed
if(Time[0]-LastUpdate>=bar2update*Period()*60)
{
   LastUpdate=Time[0];

   //--- Call main function
    ComputeIt(1);
}


//----
return(0);
  }
//+------------------------------------------------------------------+
int ComputeIt(int x)
{
int i;
int k;
double a;
double b;
//---- Set flatBuf to 0
for(i=0;i<=3*MaxPer+2;i++)
{
   FlatBuf=0;
}

//Calculate flattened price
a=Close[x+3*MaxPer-1];
b=(Close[x]-a)/(x+3*MaxPer-2);
for(i=3*MaxPer;i>=1;i--)
   FlatBuf=Close[x+i-1]-(a+b*(3*MaxPer-i));
return(0);
}
公式里的x值是什么  红色部分

主题：[求助]mt4指标，公式里的x值怎么改，谢谢