Added m_SortedElements to store channels in row,column format

Analysis/include/Detector.h

@@ -41,6 +41,8 @@ class Detector{
   private:
   /** Vector of channels associated to the dector **/
   std::vector< Channel* > m_Element;
+  /** 2D vector of channels sorted in a [row][column] format **/
+  std::vector< vector< Channel* > > m_SortedElements;
   /** Three element array with x, y, and z of some pre-defined point on the detector **/
   double m_Position[3];
   /** Three element array of angle about the x, y, and z axis **/