Vertex extrapolation

Vertex extrapolation, from 2D linear chi2 fit.

Setting of the initial state, and of its covariance matrix.

include/TFRState.h

@@ -40,20 +40,20 @@ class TFRState : public TObject {
   /*! Set the state vector */
   inline void SetStateVect(const double x[5]){
     state_vect.SetElements(x);};
-  
-  /*! Set the state vector */
-  inline void SetP(const double _P[25]){
-    P = TMatrixD(5,5,_P);};
-  
+
   /*! Set the state vector */
   inline void SetStateVect(const TVectorD vect){
     state_vect = vect;};
   
-  /*! Set the state vector */
+  /*! Set the covariance matrix */
+  inline void SetP(const double _P[25]){
+    P = TMatrixD(5,5,_P);};
+  
+  /*! Set the covariance matrix */
   inline void SetP(const TMatrixD cov){
     P = cov;};
   
-  /*! Set chi2 */
+  /*! Set the chi2 */
   inline void SetChi2(const double _chi2){chi2=_chi2;};
 
   /*! Update the tx and ty */