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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 Gen
//! @{
template<typename T1, typename gen_type>
arma_inline
Gen<T1, gen_type>::Gen(const uword in_n_rows, const uword in_n_cols)
: n_rows(in_n_rows)
, n_cols(in_n_cols)
{
arma_extra_debug_sigprint();
}
template<typename T1, typename gen_type>
arma_inline
Gen<T1, gen_type>::~Gen()
{
arma_extra_debug_sigprint();
}
template<typename T1, typename gen_type>
arma_inline
typename T1::elem_type
Gen<T1, gen_type>::operator[](const uword ii) const
{
typedef typename T1::elem_type eT;
if(is_same_type<gen_type, gen_zeros>::yes) { return eT(0); }
else if(is_same_type<gen_type, gen_ones >::yes) { return eT(1); }
else if(is_same_type<gen_type, gen_eye >::yes) { return ((ii % n_rows) == (ii / n_rows)) ? eT(1) : eT(0); }
return eT(0); // prevent pedantic compiler warnings
}
template<typename T1, typename gen_type>
arma_inline
typename T1::elem_type
Gen<T1, gen_type>::at(const uword r, const uword c) const
{
typedef typename T1::elem_type eT;
if(is_same_type<gen_type, gen_zeros>::yes) { return eT(0); }
else if(is_same_type<gen_type, gen_ones >::yes) { return eT(1); }
else if(is_same_type<gen_type, gen_eye >::yes) { return (r == c) ? eT(1) : eT(0); }
return eT(0); // prevent pedantic compiler warnings
}
template<typename T1, typename gen_type>
arma_inline
typename T1::elem_type
Gen<T1, gen_type>::at_alt(const uword ii) const
{
return operator[](ii);
}
template<typename T1, typename gen_type>
inline
void
Gen<T1, gen_type>::apply(Mat<typename T1::elem_type>& out) const
{
arma_extra_debug_sigprint();
// NOTE: we're assuming that the matrix has already been set to the correct size;
// this is done by either the Mat contructor or operator=()
if(is_same_type<gen_type, gen_zeros>::yes) { out.zeros(); }
else if(is_same_type<gen_type, gen_ones >::yes) { out.ones(); }
else if(is_same_type<gen_type, gen_eye >::yes) { out.eye(); }
}
template<typename T1, typename gen_type>
inline
void
Gen<T1, gen_type>::apply_inplace_plus(Mat<typename T1::elem_type>& out) const
{
arma_extra_debug_sigprint();
arma_debug_assert_same_size(out.n_rows, out.n_cols, n_rows, n_cols, "addition");
typedef typename T1::elem_type eT;
if(is_same_type<gen_type, gen_ones>::yes)
{
arrayops::inplace_plus(out.memptr(), eT(1), out.n_elem);
}
else
if(is_same_type<gen_type, gen_eye>::yes)
{
const uword N = (std::min)(n_rows, n_cols);
for(uword ii=0; ii < N; ++ii) { out.at(ii,ii) += eT(1); }
}
}
template<typename T1, typename gen_type>
inline
void
Gen<T1, gen_type>::apply_inplace_minus(Mat<typename T1::elem_type>& out) const
{
arma_extra_debug_sigprint();
arma_debug_assert_same_size(out.n_rows, out.n_cols, n_rows, n_cols, "subtraction");
typedef typename T1::elem_type eT;
if(is_same_type<gen_type, gen_ones>::yes)
{
arrayops::inplace_minus(out.memptr(), eT(1), out.n_elem);
}
else
if(is_same_type<gen_type, gen_eye>::yes)
{
const uword N = (std::min)(n_rows, n_cols);
for(uword ii=0; ii < N; ++ii) { out.at(ii,ii) -= eT(1); }
}
}
template<typename T1, typename gen_type>
inline
void
Gen<T1, gen_type>::apply_inplace_schur(Mat<typename T1::elem_type>& out) const
{
arma_extra_debug_sigprint();
arma_debug_assert_same_size(out.n_rows, out.n_cols, n_rows, n_cols, "element-wise multiplication");
typedef typename T1::elem_type eT;
if(is_same_type<gen_type, gen_zeros>::yes)
{
arrayops::inplace_mul(out.memptr(), eT(0), out.n_elem);
// NOTE: not using arrayops::fill_zeros(), as 'out' may have NaN elements
}
else
if(is_same_type<gen_type, gen_eye>::yes)
{
for(uword c=0; c < n_cols; ++c)
for(uword r=0; r < n_rows; ++r)
{
if(r != c) { out.at(r,c) *= eT(0); }
}
}
}
template<typename T1, typename gen_type>
inline
void
Gen<T1, gen_type>::apply_inplace_div(Mat<typename T1::elem_type>& out) const
{
arma_extra_debug_sigprint();
arma_debug_assert_same_size(out.n_rows, out.n_cols, n_rows, n_cols, "element-wise division");
typedef typename T1::elem_type eT;
if(is_same_type<gen_type, gen_zeros>::yes)
{
arrayops::inplace_div(out.memptr(), eT(0), out.n_elem);
}
else
if(is_same_type<gen_type, gen_eye>::yes)
{
for(uword c=0; c < n_cols; ++c)
for(uword r=0; r < n_rows; ++r)
{
if(r != c) { out.at(r,c) /= eT(0); }
}
}
}
template<typename T1, typename gen_type>
inline
void
Gen<T1, gen_type>::apply(subview<typename T1::elem_type>& out) const
{
arma_extra_debug_sigprint();
// NOTE: we're assuming that the submatrix has the same dimensions as the Gen object
// this is checked by subview::operator=()
if(is_same_type<gen_type, gen_zeros>::yes) { out.zeros(); }
else if(is_same_type<gen_type, gen_ones >::yes) { out.ones(); }
else if(is_same_type<gen_type, gen_eye >::yes) { out.eye(); }
}
//! @}
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