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auterman |
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#include <cmath>
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#include <iostream>
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#include "solve.h"
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#include "cls.h"
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#include "significance.h"
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template <class TClass>
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double TSolve<TClass>::_bisection(int n)
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{
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int i=0;
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double a=_left, b=_right;
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do {
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double xmid = a+(b-a)*0.5;
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double mid = (*_pt2Object.*_function)(xmid,_par);
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//std::cout<<"TSolve<TClass>::bisection(left="<<a<<", right="<<b<<"); f(mid)="<<mid<<std::endl;
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if ((*_pt2Object.*_function)(a,_par)*mid<0.) b = xmid;
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if ((*_pt2Object.*_function)(b,_par)*mid<0.) a = xmid;
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if (b-a<epsilon) return xmid;
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} while ( i<n );
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return 0;
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}
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template <class TClass>
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double TSolve<TClass>::operator()()
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{
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//std::cout<<"TSolve<TClass>::operator() " <<std::endl;
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if (!_isBracketed(_left,_right)) BracketFunction(_left,_right);
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return _bisection();
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}
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template <class TClass>
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bool TSolve<TClass>::_isBracketed(double l, double r)
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{
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//std::cerr<<"TSolve<TClass>::isBracketed(double l="<<l<<", double r="<<r<<") ? "
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// <<"CLs(l*sigma) ="<<(*_pt2Object.*_function)(l,_par)+0.05
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// <<" <-> CLs(r*sigma)="<< (*_pt2Object.*_function)(r,_par)+0.05<<std::endl;
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return (*_pt2Object.*_function)(l,_par) * (*_pt2Object.*_function)(r,_par) <= 0.0;
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}
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template <class TClass>
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void TSolve<TClass>::BracketFunction(double l, double r)
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{
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//std::cout<<"TSolve<TClass>::BracketFunction(double l="<<l<<", double r="<<r<<")"<<std::endl;
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//double ix = epsilon;
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double ix = 1;
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int i=0;
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do {
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if (i>5) throw TSolveException("Not converged! Cannot be bracketed!");
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ix *= 2.;
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++i;
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// } while(!_isBracketed(l-ix,r+ix) && ix<100000);
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// _left = l-ix;
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// _right = r+ix;
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} while(!_isBracketed(l/ix,r*ix) && ix<100000 );
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_left = l/ix;
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_right = r*ix;
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}
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template class TSolve<cls>;
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template class TSolve<TSignificance>;
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