18 gradient_function_t gradient_fun,
size_t npars,
20 : ROOT::Math::FitMethodFunction(static_cast<int>(npars), static_cast<int>(ndatasize)),
21 m_objective_fun(objective_fun), m_gradient_fun(gradient_fun), m_npars(npars),
26 RootResidualFunction::Type_t RootResidualFunction::Type()
const
28 return ROOT::Math::FitMethodFunction::kLeastSquare;
31 ROOT::Math::IMultiGenFunction* RootResidualFunction::Clone()
const
44 double* gradients)
const
46 std::vector<double> par_values;
47 par_values.resize(m_npars, 0.0);
48 std::copy(pars, pars + m_npars, par_values.begin());
50 std::vector<double> par_gradients;
53 par_gradients.resize(m_npars);
56 double result = m_gradient_fun(par_values, index, par_gradients);
60 for (
size_t i = 0; i < m_npars; ++i)
61 gradients[i] = par_gradients[i];
66 double RootResidualFunction::DoEval(
const double* pars)
const
68 std::vector<double> par_values;
69 par_values.resize(m_npars, 0.0);
70 std::copy(pars, pars + m_npars, par_values.begin());
71 return m_objective_fun(par_values);
Declares class RootResidualFunction.
double DataElement(const double *pars, unsigned int index, double *gradients=0) const override
Evaluation of single data element residual. Will be called by ROOT minimizer.
RootResidualFunction(scalar_function_t objective_fun, gradient_function_t gradient_fun, size_t npars, size_t ndatasize)
Constructs RootResidualFunction.