// Copyright (C) 2009-2012 National ICT Australia (NICTA)
// 
// This Source Code Form is subject to the terms of the Mozilla Public
// License, v. 2.0. If a copy of the MPL was not distributed with this
// file, You can obtain one at http://mozilla.org/MPL/2.0/.
// -------------------------------------------------------------------
// 
// Written by Conrad Sanderson - http://conradsanderson.id.au


//! \addtogroup op_var
//! @{



//! Class for finding variance values of a matrix
class op_var
  {
  public:
  
  template<typename T1>
  inline static void apply(Mat<typename T1::pod_type>& out, const mtOp<typename T1::pod_type, T1, op_var>& in);
  
  
  //
  
  template<typename eT>
  inline static typename get_pod_type<eT>::result var_vec(const subview_col<eT>& X, const uword norm_type = 0);

  template<typename eT>
  inline static typename get_pod_type<eT>::result var_vec(const subview_row<eT>& X, const uword norm_type = 0);
  
  template<typename T1>
  inline static typename T1::pod_type var_vec(const Base<typename T1::elem_type, T1>& X, const uword norm_type = 0);
  
  
  //
  
  template<typename eT>
  inline static eT direct_var(const eT* const X, const uword N, const uword norm_type = 0);
  
  template<typename eT>
  inline static eT direct_var_robust(const eT* const X, const uword N, const uword norm_type = 0);
  
  
  //
  
  template<typename T>
  inline static  T direct_var(const std::complex<T>* const X, const uword N, const uword norm_type = 0);
  
  template<typename T>
  inline static  T direct_var_robust(const std::complex<T>* const X, const uword N, const uword norm_type = 0);
  };



//! @}