included files for data compression, saving only hits

git-svn-id: file:///afs/psi.ch/project/sls_det_software/svn/slsDetectorSoftware@671 951219d9-93cf-4727-9268-0efd64621fa3

slsDetectorSoftware/slsDetectorAnalysis/runningStat.h

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+  /********************************************//**
+ * @file runningStat.h
+ * @short handles pedestal data and doesnt move
+ ***********************************************/
+#ifndef RUNNINGSTAT_H
+#define RUNNINGSTAT_H
+
+#include <math.h>
+
+#include "sls_detector_defs.h"
+
+
+/**
+   @short class handling pedestal data that is static
+ */
+
+class runningStat{
+
+public:
+	/**
+	 * Constructor
+	 */
+	runningStat() : m_n(0),m_oldM(0),m_newM(0),m_oldS(0),m_newS(0) {}
+
+	/**
+	 * Clear number of data values
+	 */
+	void Clear(){
+		m_n = 0;
+	}
+
+	/**
+	 * Push Pedestal
+	 */
+	void Push(double x){
+		m_n++;
+
+		// See Knuth TAOCP vol 2, 3rd edition, page 232
+		if (m_n == 1){
+			m_oldM = m_newM = x;
+			m_oldS = 0.0;
+		}else{
+			m_newM = m_oldM + (x - m_oldM)/m_n;
+			m_newS = m_oldS + (x - m_oldM)*(x - m_newM);
+
+			// set up for next iteration
+			m_oldM = m_newM;
+			m_oldS = m_newS;
+		}
+	}
+
+	/**
+	 * Get number of data values
+	 */
+	int NumDataValues() const{
+		return m_n;
+	}
+
+	/**
+	 * Get mean
+	 */
+	double Mean() const{
+		return (m_n > 0) ? m_newM : 0.0;
+	}
+
+	/**
+	 * Get variance
+	 */
+	double Variance() const{
+		return ( (m_n > 1) ? m_newS/(m_n - 1) : 0.0 );
+	}
+
+	/**
+	 * Get standard deviation
+	 */
+	double StandardDeviation() const{
+		return sqrt( Variance() );
+	}
+
+private:
+	/** number of data values */
+	int m_n;
+
+	/** old and new mean */
+	double m_oldM, m_newM, m_oldS, m_newS;
+
+};
+
+#endif