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////////////////////////////////////////////////////////////////////////
//
// Copyright (C) 1996-2025 The Octave Project Developers
//
// See the file COPYRIGHT.md in the top-level directory of this
// distribution or <https://octave.org/copyright/>.
//
// This file is part of Octave.
//
// Octave is free software: you can redistribute it and/or modify it
// under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// Octave is distributed in the hope that it will be useful, but
// WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with Octave; see the file COPYING. If not, see
// <https://www.gnu.org/licenses/>.
//
////////////////////////////////////////////////////////////////////////
// This file should not include config.h. It is only included in other
// C++ source files that should have included config.h before including
// this file.
#include <algorithm>
#include "DiagArray2.h"
#include "lo-error.h"
template <typename T>
DiagArray2<T>::DiagArray2 (const Array<T>& a, octave_idx_type r,
octave_idx_type c)
: Array<T> (a.as_column ()), m_d1 (r), m_d2 (c)
{
octave_idx_type rcmin = std::min (r, c);
if (rcmin != a.numel ())
Array<T>::resize (dim_vector (rcmin, 1));
}
template <typename T>
Array<T>
DiagArray2<T>::extract_diag (octave_idx_type k) const
{
Array<T> d;
if (k == 0)
// The main diagonal is shallow-copied.
d = *this;
else if (k > 0 && k < cols ())
d = Array<T> (dim_vector (std::min (cols () - k, rows ()), 1), T ());
else if (k < 0 && -k < rows ())
d = Array<T> (dim_vector (std::min (rows () + k, cols ()), 1), T ());
else // Matlab returns [] 0x1 for out-of-range diagonal
d.resize (dim_vector (0, 1));
return d;
}
template <typename T>
DiagArray2<T>
DiagArray2<T>::transpose () const
{
return DiagArray2<T> (*this, m_d2, m_d1);
}
template <typename T>
DiagArray2<T>
DiagArray2<T>::hermitian (T (* fcn) (const T&)) const
{
return DiagArray2<T> (Array<T>::template map<T> (fcn), m_d2, m_d1);
}
// A two-dimensional array with diagonal elements only.
template <typename T>
T&
DiagArray2<T>::elem (octave_idx_type r, octave_idx_type c)
{
static T zero (0);
return (r == c) ? Array<T>::elem (r) : zero;
}
template <typename T>
T&
DiagArray2<T>::checkelem (octave_idx_type r, octave_idx_type c)
{
static T zero (0);
return check_idx (r, c) ? elem (r, c) : zero;
}
template <typename T>
void
DiagArray2<T>::resize (octave_idx_type r, octave_idx_type c,
const T& rfv)
{
if (r < 0 || c < 0)
(*current_liboctave_error_handler) ("can't resize to negative dimensions");
if (r != dim1 () || c != dim2 ())
{
Array<T>::resize (dim_vector (std::min (r, c), 1), rfv);
m_d1 = r; m_d2 = c;
}
}
template <typename T>
Array<T>
DiagArray2<T>::array_value () const
{
Array<T> result (dims (), T (0));
for (octave_idx_type i = 0, len = length (); i < len; i++)
result.xelem (i, i) = dgelem (i);
return result;
}
template <typename T>
bool
DiagArray2<T>::check_idx (octave_idx_type r, octave_idx_type c) const
{
bool ok = true;
if (r < 0 || r >= dim1 ())
octave::err_index_out_of_range (2, 1, r+1, dim1 (), dims ());
if (c < 0 || c >= dim2 ())
octave::err_index_out_of_range (2, 2, c+1, dim2 (), dims ());
return ok;
}
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