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:    10-20 Indicator
				//  Author/Uploader: Dennis Skoblar 
				//  E-mail:          DennisAndLisa@sbcglobal.net
				//  Date/Time Added: 2005-06-14 04:09:34
				//  Origin:          Dave Landry On Swing Trading by Dave Landry
				//  Keywords:        Dave Landry,Landry,10-20 indicator
				//  Level:           basic
				//  Flags:           indicator
				//  Formula URL:     http://www.amibroker.com/library/formula.php?id=471
				//  Details URL:     http://www.amibroker.com/library/detail.php?id=471
				//
				//------------------------------------------------------------------------------
				//
				//  Shows how many points the stock has gone in a 20 day (one month) period.
				//  The ideal would be for a stock to move 10 points in a 20 day period.
				//
				//------------------------------------------------------------------------------
				
				_SECTION_BEGIN("TenTwentyValue");
				TenTwentyValue = HHV(H,20)-LLV(L,20);
				Plot(TenTwentyValue,"10/20 Value",colorRed,styleLine);
				_SECTION_END();