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00001 #ifndef PhysicsTools_Utilities_SmoothStepFunction_h 00002 #define PhysicsTools_Utilities_SmoothStepFunction_h 00003 #include "PhysicsTools/Utilities/interface/Parameter.h" 00004 #include <boost/shared_ptr.hpp> 00005 #include <cmath> 00006 00007 namespace function { 00008 00009 struct SmoothStepFunction { 00010 static const unsigned int arguments = 1; 00011 SmoothStepFunction(const Parameter & t) : 00012 trend(t.ptr()) { } 00013 SmoothStepFunction(boost::shared_ptr<double> t): 00014 trend(t) { } 00015 SmoothStepFunction(double t): 00016 trend(new double(t)){} 00017 double operator()(double x) const { 00018 double z = (x - 40)*(*trend); 00019 if(fabs(z)<0) return 0; 00020 return 2/(1+exp(-z)) -1; 00021 } 00022 boost::shared_ptr<double> trend; 00023 }; 00024 00025 } 00026 00027 #endif
1.7.3