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// 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 op_diff
//! @{
template<typename eT>
inline
void
op_diff::apply_noalias(Mat<eT>& out, const Mat<eT>& X, const uword k, const uword dim)
{
arma_extra_debug_sigprint();
uword n_rows = X.n_rows;
uword n_cols = X.n_cols;
if(dim == 0)
{
if(n_rows <= k) { out.set_size(0,n_cols); return; }
--n_rows;
out.set_size(n_rows,n_cols);
for(uword col=0; col < n_cols; ++col)
{
eT* out_colmem = out.colptr(col);
const eT* X_colmem = X.colptr(col);
for(uword row=0; row < n_rows; ++row)
{
const eT val0 = X_colmem[row ];
const eT val1 = X_colmem[row+1];
out_colmem[row] = val1 - val0;
}
}
if(k >= 2)
{
for(uword iter=2; iter <= k; ++iter)
{
--n_rows;
for(uword col=0; col < n_cols; ++col)
{
eT* colmem = out.colptr(col);
for(uword row=0; row < n_rows; ++row)
{
const eT val0 = colmem[row ];
const eT val1 = colmem[row+1];
colmem[row] = val1 - val0;
}
}
}
out = out( span(0,n_rows-1), span::all );
}
}
else
if(dim == 1)
{
if(n_cols <= k) { out.set_size(n_rows,0); return; }
--n_cols;
out.set_size(n_rows,n_cols);
if(n_rows == 1)
{
const eT* X_mem = X.memptr();
eT* out_mem = out.memptr();
for(uword col=0; col < n_cols; ++col)
{
const eT val0 = X_mem[col ];
const eT val1 = X_mem[col+1];
out_mem[col] = val1 - val0;
}
}
else
{
for(uword col=0; col < n_cols; ++col)
{
eT* out_col_mem = out.colptr(col);
const eT* X_col0_mem = X.colptr(col );
const eT* X_col1_mem = X.colptr(col+1);
for(uword row=0; row < n_rows; ++row)
{
out_col_mem[row] = X_col1_mem[row] - X_col0_mem[row];
}
}
}
if(k >= 2)
{
for(uword iter=2; iter <= k; ++iter)
{
--n_cols;
if(n_rows == 1)
{
eT* out_mem = out.memptr();
for(uword col=0; col < n_cols; ++col)
{
const eT val0 = out_mem[col ];
const eT val1 = out_mem[col+1];
out_mem[col] = val1 - val0;
}
}
else
{
for(uword col=0; col < n_cols; ++col)
{
eT* col0_mem = out.colptr(col );
const eT* col1_mem = out.colptr(col+1);
for(uword row=0; row < n_rows; ++row)
{
col0_mem[row] = col1_mem[row] - col0_mem[row];
}
}
}
}
out = out( span::all, span(0,n_cols-1) );
}
}
}
template<typename T1>
inline
void
op_diff::apply(Mat<typename T1::elem_type>& out, const Op<T1,op_diff>& in)
{
arma_extra_debug_sigprint();
typedef typename T1::elem_type eT;
const uword k = in.aux_uword_a;
const uword dim = in.aux_uword_b;
arma_debug_check( (dim > 1), "diff(): parameter 'dim' must be 0 or 1" );
if(k == 0) { out = in.m; return; }
const quasi_unwrap<T1> U(in.m);
if(U.is_alias(out))
{
Mat<eT> tmp;
op_diff::apply_noalias(tmp, U.M, k, dim);
out.steal_mem(tmp);
}
else
{
op_diff::apply_noalias(out, U.M, k, dim);
}
}
template<typename T1>
inline
void
op_diff_default::apply(Mat<typename T1::elem_type>& out, const Op<T1,op_diff_default>& in)
{
arma_extra_debug_sigprint();
typedef typename T1::elem_type eT;
const uword k = in.aux_uword_a;
if(k == 0) { out = in.m; return; }
const quasi_unwrap<T1> U(in.m);
const uword dim = (T1::is_row) ? 1 : 0;
if(U.is_alias(out))
{
Mat<eT> tmp;
op_diff::apply_noalias(tmp, U.M, k, dim);
out.steal_mem(tmp);
}
else
{
op_diff::apply_noalias(out, U.M, k, dim);
}
}
//! @}
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