Prev Next det_33.hpp Headings

@(@\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_33
# ifndef CPPAD_DET_33_HPP
# define CPPAD_DET_33_HPP
# include <cppad/utility/near_equal.hpp>
namespace CppAD {
template <class Vector>
     bool det_33(const Vector &x, const Vector &d)
     {     bool ok = true;
          double eps99 = 99.0 * std::numeric_limits<double>::epsilon();

          // use expansion by minors to compute the determinant by hand
          double check = 0.;
          check += x[0] * ( x[4] * x[8] - x[5] * x[7] );
          check -= x[1] * ( x[3] * x[8] - x[5] * x[6] );
          check += x[2] * ( x[3] * x[7] - x[4] * x[6] );

          ok &= CppAD::NearEqual(check, d[0], eps99, eps99);

          return ok;
     }
}
# endif

Input File: omh/det_33_hpp.omh