Aakash-kaushik/mlpack/lin__alg__impl_8hpp_source.html

 #ifndef MLPACK_CORE_MATH_LIN_ALG_IMPL_HPP
 #define MLPACK_CORE_MATH_LIN_ALG_IMPL_HPP

 #include "lin_alg.hpp"

 namespace mlpack {
 namespace math {

 inline size_t SvecIndex(size_t i, size_t j, size_t n)
 {
   if (i > j)
     std::swap(i, j);
   return (j-i) + (n*(n+1) - (n-i)*(n-i+1))/2;
 }

 } // namespace math
 } // namespace mlpack

 #endif
mlpack
Linear algebra utility functions, generally performed on matrices or vectors.
Definition: cv.hpp:1

lin_alg.hpp

mlpack::math::SvecIndex
size_t SvecIndex(size_t i, size_t j, size_t n)
Return the index such that A[i,j] == factr(i, j) * svec(A)[pos(i, j)], where factr(i, j) = sqrt(2) if i != j and 1 otherwise.
Definition: lin_alg_impl.hpp:18