一个更精度的平滑涵数, 可用于股票交易系统.用于Amibroker 平台

				//------------------------------------------------------------------------------
				//
				//  Formula Name:    Force index
				//  Author/Uploader: Thomas Youssef 
				//  E-mail:          thomasmejl@hotmail.com
				//  Date/Time Added: 2005-02-22 02:07:19
				//  Origin:          
				//  Keywords:        force index Alexander Elder indicator
				//  Level:           basic
				//  Flags:           indicator
				//  Formula URL:     http://www.amibroker.com/library/formula.php?id=433
				//  Details URL:     http://www.amibroker.com/library/detail.php?id=433
				//
				//------------------------------------------------------------------------------
				//
				//  Alexander Elder磗 classic force index indicator
				//
				//  I use them on swedish stocks, weekly.
				//
				//  The rules are easy:
				//
				//  If the indicator is below zero AND there is a bullish divergence, then go
				//  LONG
				//
				//  If the indicator is above zero AND there is a bearish divergence, then go
				//  SHORT
				//
				//  Works well when you have a head and shoulder or a triangular formation
				//  against the zeroline.
				//
				//------------------------------------------------------------------------------
				
				/*Made by Thomas Youssef, 2005-01-15
				
				Alexander Elder磗 classic force index indicator
				
				I use them on swedish stocks, weekly.
				
				The rules are easy:
				
				If the indicator is below zero AND there is a bullish divergence, then go LONG
				If the indicator is above zero AND there is a bearish divergence, then go SHORT
				
				Works well when you have a head and shoulder or a triangular formation against the zeroline.
				
				
				*/
				
				_SECTION_BEGIN("Force index");
				FI=EMA(((C-Ref(C,-1))*V),13);
				
				
				Plot(FI,"FI",12,5);
				Plot(0,"ZERO LINE",colorWhite,styleThick);
				_SECTION_END();