codac2_MatrixBase_addons_VectorBase.h

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template<int R=RowsAtCompileTime,int C=ColsAtCompileTime>
  requires IsVectorOrRow<R,C>
inline auto diag_matrix() const
{
  return this->asDiagonal().toDenseMatrix();
}

template<int R=RowsAtCompileTime,int C=ColsAtCompileTime>
  requires IsVectorOrRow<R,C>
inline auto subvector(Index start_id, Index end_id) const
{
  assert_release(end_id >= 0 && start_id >= 0);
  assert_release(end_id < this->size() && start_id <= end_id);
  return this->segment(start_id,end_id-start_id+1);
}