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// SPDX-License-Identifier: Apache-2.0
//
// Copyright 2008-2016 Conrad Sanderson (http://conradsanderson.id.au)
// Copyright 2008-2016 National ICT Australia (NICTA)
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// ------------------------------------------------------------------------
//! \addtogroup diagview
//! @{
//! Class for storing data required to extract and set the diagonals of a matrix
template<typename eT>
class diagview : public Base< eT, diagview<eT> >
{
public:
typedef eT elem_type;
typedef typename get_pod_type<eT>::result pod_type;
arma_aligned const Mat<eT>& m;
static constexpr bool is_row = false;
static constexpr bool is_col = true;
static constexpr bool is_xvec = false;
const uword row_offset;
const uword col_offset;
const uword n_rows; // equal to n_elem
const uword n_elem;
static constexpr uword n_cols = 1;
protected:
arma_inline diagview(const Mat<eT>& in_m, const uword in_row_offset, const uword in_col_offset, const uword len);
public:
inline ~diagview();
inline diagview() = delete;
inline diagview(const diagview& in);
inline diagview( diagview&& in);
inline void operator=(const diagview& x);
inline void operator+=(const eT val);
inline void operator-=(const eT val);
inline void operator*=(const eT val);
inline void operator/=(const eT val);
template<typename T1> inline void operator= (const Base<eT,T1>& x);
template<typename T1> inline void operator+=(const Base<eT,T1>& x);
template<typename T1> inline void operator-=(const Base<eT,T1>& x);
template<typename T1> inline void operator%=(const Base<eT,T1>& x);
template<typename T1> inline void operator/=(const Base<eT,T1>& x);
arma_inline eT at_alt (const uword ii) const;
arma_inline eT& operator[](const uword ii);
arma_inline eT operator[](const uword ii) const;
arma_inline eT& at(const uword ii);
arma_inline eT at(const uword ii) const;
arma_inline eT& operator()(const uword ii);
arma_inline eT operator()(const uword ii) const;
arma_inline eT& at(const uword in_n_row, const uword);
arma_inline eT at(const uword in_n_row, const uword) const;
arma_inline eT& operator()(const uword in_n_row, const uword in_n_col);
arma_inline eT operator()(const uword in_n_row, const uword in_n_col) const;
inline void replace(const eT old_val, const eT new_val);
inline void clean(const pod_type threshold);
inline void clamp(const eT min_val, const eT max_val);
inline void fill(const eT val);
inline void zeros();
inline void ones();
inline void randu();
inline void randn();
inline static void extract(Mat<eT>& out, const diagview& in);
inline static void plus_inplace(Mat<eT>& out, const diagview& in);
inline static void minus_inplace(Mat<eT>& out, const diagview& in);
inline static void schur_inplace(Mat<eT>& out, const diagview& in);
inline static void div_inplace(Mat<eT>& out, const diagview& in);
friend class Mat<eT>;
friend class subview<eT>;
};
//! @}
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