added CircularMean to PW class

.vscode/c_cpp_properties.json

@@ -37,6 +37,18 @@
             "cppStandard": "gnu++17",
             "intelliSenseMode": "linux-gcc-x64"
         },
+        {
+            "name": "RyanHome",
+            "includePath": [
+                "${workspaceFolder}/**",
+                "/home/ryan/root_v6.30.06/**"
+            ],
+            "defines": [],
+            "compilerPath": "/usr/bin/gcc",
+            "cStandard": "c17",
+            "cppStandard": "gnu++17",
+            "intelliSenseMode": "linux-gcc-x64"
+        },
         {
             "name": "Dirac",
             "includePath": [

Armory/ClassPW.h

@@ -65,6 +65,8 @@ public:
   void CalTrack(TVector3 sx3Pos, int anodeID, int cathodeID, bool verbose = false);
   void CalTrack2(TVector3 sx3Pos, PWHitInfo hitInfo, double sigmaA = 0, double sigmaC = 0, bool verbose = false);
 
+  double CircularMean(std::vector<std::pair<int, double>> wireList);
+
   void Print(){
     printf("     The nearest | Anode: %2d(%5.2f) Cathode: %2d(%5.2f)\n", hitInfo.nearestWire.first, 
                                                                          hitInfo.nearestDist.first, 
@@ -280,4 +282,21 @@ inline double PW::GetZ0(){
 
 }
 
+inline double PW::CircularMean(std::vector<std::pair<int, double>> wireList){
+
+  //use unit vector, wireID start from Zero
+  double xCom = 0, yCom = 0;
+  for( size_t i = 0; i < wireList.size() ; i++){
+    xCom += TMath::Cos(TMath::TwoPi() * wireList[i].first / nWire) * wireList[i].second;
+    yCom += TMath::Sin(TMath::TwoPi() * wireList[i].first / nWire) * wireList[i].second;
+  }
+
+  //calculate the angle of the summed unit vectors
+  double angle = TMath::ATan2(yCom, xCom);
+  if( angle < 0 ) angle += TMath::TwoPi(); // convert the angle from 0 to 2 pi
+
+  return angle/ TMath::TwoPi() * nWire;
+
+}
+
 #endif