[Rivet-svn] r2632 - trunk/include/Rivet/Math

[blackhole at projects.hepforge.org]

Author: buckley
Date: Sun Aug  1 18:49:11 2010
New Revision: 2632

Log:
Improved fuzzyEquals implementation, thanks to Mike Seymour for pointing out the deficiencies of the previous form

Modified:
   trunk/include/Rivet/Math/MathUtils.hh

Modified: trunk/include/Rivet/Math/MathUtils.hh
==============================================================================
--- trunk/include/Rivet/Math/MathUtils.hh	Sun Aug  1 13:56:01 2010	(r2631)
+++ trunk/include/Rivet/Math/MathUtils.hh	Sun Aug  1 18:49:11 2010	(r2632)
@@ -49,7 +49,7 @@
   inline bool fuzzyEquals(double a, double b, double tolerance=1E-5) {
     const double absavg = fabs(a + b)/2.0;
     const double absdiff = fabs(a - b);
-    const bool rtn = (absavg == 0.0 && absdiff == 0.0) || absdiff/absavg < tolerance;
+    const bool rtn = (absavg == 0.0 && absdiff == 0.0) || absdiff < tolerance*absavg;
     return rtn;
   }