//+------------------------------------------------------------------+
//| DEMA.mq4 |
//| DEMA = 2 * EMA - EMA of EMA |
//+------------------------------------------------------------------+
#property link "http://www.forexfactory.com/showthread.php?t=29419"
#property indicator_chart_window
#property indicator_buffers 1
#property indicator_color1 Red
#property indicator_width1 1
//---- input parameters
extern int PERIOD =12;
//---- indicator buffer
double Buffer[];
//+------------------------------------------------------------------+
//| Custom indicator initialization function |
//+------------------------------------------------------------------+
int init()
{
IndicatorShortName("DEMA("+PERIOD+")");
SetIndexBuffer(0,Buffer);
SetIndexStyle(0,DRAW_LINE);
}
//+------------------------------------------------------------------+
int start()
{
int limit=Bars-1-IndicatorCounted();
//----
static double lastEMA, lastEMA_of_EMA;
double weight=2.0/(1.0+PERIOD);
if(IndicatorCounted()==0)
{
Buffer[limit] =Close[limit];
lastEMA =Close[limit];
lastEMA_of_EMA =Close[limit];
limit--;
}
//----
// Calculate old bars (not the latest), if necessary
for(int i=limit; i > 0; i--)
{
lastEMA =weight*Close[i] + (1.0-weight)*lastEMA;
lastEMA_of_EMA =weight*lastEMA + (1.0-weight)*lastEMA_of_EMA;
Buffer[i]=2.0*lastEMA - lastEMA_of_EMA;
}
//----
// (Re)calculate current bar
double EMA =weight*Close[0] + (1.0-weight)*lastEMA,
EMA_of_EMA =weight*EMA + (1.0-weight)*lastEMA_of_EMA;
Buffer[0]=2.0*EMA - EMA_of_EMA;
//----
return(0);
}
//+------------------------------------------------------------------+
Sample
Analysis
Market Information Used:
Series array that contains close prices for each bar
Indicator Curves created:
Implements a curve of type DRAW_LINE
Indicators Used:
Custom Indicators Used:
Order Management characteristics:
Other Features: