lcsim/src/org/lcsim/contrib/seedtracker

diff -u -r1.1 -r1.2
--- SortHits.java	4 Apr 2008 23:41:33 -0000	1.1
+++ SortHits.java	27 Aug 2008 17:25:08 -0000	1.2
@@ -21,18 +21,19 @@

     private double _xc;
     private double _yc;
     private double _R;

-    

+    private double _R2; 

     /** Creates a new instance of SortHits */
     public SortHits(HelicalTrackFit helix) {
         //  Find the helix center, radius, error
         _xc = helix.xc();
         _yc = helix.yc();
         _R = helix.R();

+        _R2 = _R*_R; 

     }
     
     public int compare(HelicalTrackHit a, HelicalTrackHit b) {

-        double difa = Math.pow(a.x() - _xc, 2) + Math.pow(a.y() - _yc, 2) - _R * _R;
-        double difb = Math.pow(b.x() - _xc, 2) + Math.pow(b.y() - _yc, 2) - _R * _R;

+        double difa = (a.x() - _xc)*(a.x() - _xc) + (a.y() - _yc)*(a.y() - _yc) - _R2;
+        double difb = (b.x() - _xc)*(b.x() - _xc) + (b.y() - _yc)*(b.y() - _yc) - _R2;

         if (difa * difa > difb * difb) return 1;
         if (difa * difa == difb * difb) return 0;
         return -1;