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Very basic example

If you're showing a higher timeframe indicator on a lower, this wont show any history - you just get a straight line when you first put it on the chart

Does show how much the leading edge of almost all indicators does waggle around in live trading...

#property copyright "Copyright © 2010, SelectFX"
#property link      "http://www.selectfx.net"

#property indicator_chart_window
#property indicator_buffers 1
//----
#property indicator_color1 Red



extern int DataPeriod = 8;      // The period to use of the MA on the other timeframe
extern int TimeFrameSwitch = 4; // 1=M1 - 9=MN1   - done this way to make backtesting easier with an EA ;)
extern int LTT.MaMethod = 1;    // 0=SMA 1=EMA 2=Smoothed 3=LWMA
extern int CurrentBar = 0;
   
int shift, limit, counted_bars, TimeFrame;
string strSymbol;
   

//----
double Buffer0[];

static bool IsInitialLoad;

/*
SFX AnyMAAnyPeriod.mq4


*/
//+------------------------------------------------------------------+
//|                                                                  |
//+------------------------------------------------------------------+
  void init() 
  {
  
   SetIndexBuffer(0, Buffer0);
   SetIndexStyle (0, DRAW_LINE, STYLE_SOLID, 1);
   SetIndexLabel(0, "Buffer0");
   
   
   IsInitialLoad = true;
   
   
   //---- name for DataWindow and indicator subwindow label
   IndicatorShortName("SFX Any MA Any Period");



  }
//+------------------------------------------------------------------+
//|                                                                  |
//+------------------------------------------------------------------+
  void deinit() 
  {}
//+------------------------------------------------------------------+
//|                                                                  |
//+------------------------------------------------------------------+
  int start() 
  {

 strSymbol = Symbol();
 TimeFrame = TimeFrameSwitcher(TimeFrameSwitch);

      counted_bars=IndicatorCounted();

      if(counted_bars>0) counted_bars--;
      limit=Bars-counted_bars;
    
       for(shift = 0; shift < limit; shift++)
        {
         // First Indicator Data
         Buffer0[shift] = iMA(strSymbol, TimeFrame, DataPeriod, 0, LTT.MaMethod, PRICE_CLOSE, CurrentBar+0);

        }

 }
//+------------------------------------------------------------------+

int TimeFrameSwitcher(int iSP)
 {
  // Takes a number 1-9 returns a chart period
  int iP=0;
 
   switch (iSP) 
   {
    case 1:
     iP=PERIOD_M1;
     break;
    
    case 2:
     iP=PERIOD_M5;
     break;
    
    case 3:
     iP=PERIOD_M15;
     break;
     
    case 4:
     iP=PERIOD_M30;
     break;
    
    case 5:
     iP=PERIOD_H1;
     break;
    
    case 6:
     iP=PERIOD_H4;
     break;
     
    case 7:
     iP=PERIOD_D1;
     break;
    
    case 8:
     iP=PERIOD_W1;
     break;
    
    case 9:
     iP=PERIOD_MN1;
     break;
   }  
 
 return(iP);
 }
 

FWIW

-BB-