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@(@\newcommand{\W}[1]{ \; #1 \; } \newcommand{\R}[1]{ {\rm #1} } \newcommand{\B}[1]{ {\bf #1} } \newcommand{\D}[2]{ \frac{\partial #1}{\partial #2} } \newcommand{\DD}[3]{ \frac{\partial^2 #1}{\partial #2 \partial #3} } \newcommand{\Dpow}[2]{ \frac{\partial^{#1}}{\partial {#2}^{#1}} } \newcommand{\dpow}[2]{ \frac{ {\rm d}^{#1}}{{\rm d}\, {#2}^{#1}} }@)@
Source: det_by_minor
# ifndef CPPAD_DET_BY_MINOR_HPP
# define CPPAD_DET_BY_MINOR_HPP
# include <cppad/speed/det_of_minor.hpp>
# include <vector>

// BEGIN CppAD namespace
namespace CppAD {

template <class Scalar>
class det_by_minor {
private:
     size_t              m_;

     // made mutable because modified and then restored
     mutable std::vector<size_t> r_;
     mutable std::vector<size_t> c_;

     // make mutable because its value does not matter
     mutable std::vector<Scalar> a_;
public:
     det_by_minor(size_t m) : m_(m) , r_(m + 1) , c_(m + 1), a_(m * m)
     {
          size_t i;

          // values for r and c that correspond to entire matrix
          for(i = 0; i < m; i++)
          {     r_[i] = i+1;
               c_[i] = i+1;
          }
          r_[m] = 0;
          c_[m] = 0;
     }

     template <class Vector>
     inline Scalar operator()(const Vector &x) const
     {     size_t i = m_ * m_;
          while(i--)
               a_[i] = x[i];
          return det_of_minor(a_, m_, m_, r_, c_);
     }

};

} // END CppAD namespace
# endif

Input File: omh/det_by_minor_hpp.omh