remove old code that uses the derivative of the distance functions (instead of...

remove old code that uses the derivative of the distance functions (instead of the derivative of the squared distance function)

[[Imported from SVN: r5666]]

src/averagedistanceassembler.hh

@@ -33,16 +33,9 @@ public:
                           typename TargetSpace::EmbeddedTangentVector& gradient) const
     {
         gradient = 0;
-#if 0  // This old code uses the derivative of dist(,), which is (frequently, at least)
-        // not differentiable at 0
-        for (size_t i=0; i<coefficients_.size(); i++)
-            gradient.axpy(weights_[i]*TargetSpace::distance(coefficients_[i], x),
-                          TargetSpace::derivativeOfDistanceWRTSecondArgument(coefficients_[i], x));
-#else
         for (size_t i=0; i<coefficients_.size(); i++)
             gradient.axpy(0.5*weights_[i], 
                           TargetSpace::derivativeOfDistanceSquaredWRTSecondArgument(coefficients_[i], x));
-#endif
     }
 
     void assembleHessianApproximation(const TargetSpace& x,