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revision 25485, Mon Sep 22 07:52:52 2008 UTC revision 25486, Mon Sep 22 12:43:03 2008 UTC
# Line 113  Line 113 
113    
114     // calculate derivative using mathcore derivator     // calculate derivative using mathcore derivator
115     double DoDerivative (const double * x, unsigned int icoord  ) const {     double DoDerivative (const double * x, unsigned int icoord  ) const {
116        static double step = 1.0E-8;        static double kEps = 1.E-6;
117          static double kPrecision = 1.E-8; // sqrt(epsilon)
118          double x0 = x[icoord];
119          double step = std::max( kEps* std::abs(x0), 8.0*kPrecision*(std::abs(x0) + kPrecision) );
120        return ROOT::Math::Derivator::Eval(*fFunc, x, icoord, step);        return ROOT::Math::Derivator::Eval(*fFunc, x, icoord, step);
121     }     }
122    
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