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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 op_stddev
//! @{
template<typename T1>
inline
void
op_stddev::apply(Mat<typename T1::pod_type>& out, const mtOp<typename T1::pod_type, T1, op_stddev>& in)
{
arma_extra_debug_sigprint();
typedef typename T1::pod_type out_eT;
const uword norm_type = in.aux_uword_a;
const uword dim = in.aux_uword_b;
arma_debug_check( (norm_type > 1), "stddev(): parameter 'norm_type' must be 0 or 1" );
arma_debug_check( (dim > 1), "stddev(): parameter 'dim' must be 0 or 1" );
const quasi_unwrap<T1> U(in.m);
if(U.is_alias(out))
{
Mat<out_eT> tmp;
op_stddev::apply_noalias(tmp, U.M, norm_type, dim);
out.steal_mem(tmp);
}
else
{
op_stddev::apply_noalias(out, U.M, norm_type, dim);
}
}
template<typename in_eT>
inline
void
op_stddev::apply_noalias(Mat<typename get_pod_type<in_eT>::result>& out, const Mat<in_eT>& X, const uword norm_type, const uword dim)
{
arma_extra_debug_sigprint();
typedef typename get_pod_type<in_eT>::result out_eT;
const uword X_n_rows = X.n_rows;
const uword X_n_cols = X.n_cols;
if(dim == 0)
{
arma_extra_debug_print("op_stddev::apply_noalias(): dim = 0");
out.set_size((X_n_rows > 0) ? 1 : 0, X_n_cols);
if(X_n_rows > 0)
{
out_eT* out_mem = out.memptr();
for(uword col=0; col<X_n_cols; ++col)
{
out_mem[col] = std::sqrt( op_var::direct_var( X.colptr(col), X_n_rows, norm_type ) );
}
}
}
else
if(dim == 1)
{
arma_extra_debug_print("op_stddev::apply_noalias(): dim = 1");
out.set_size(X_n_rows, (X_n_cols > 0) ? 1 : 0);
if(X_n_cols > 0)
{
podarray<in_eT> dat(X_n_cols);
in_eT* dat_mem = dat.memptr();
out_eT* out_mem = out.memptr();
for(uword row=0; row<X_n_rows; ++row)
{
dat.copy_row(X, row);
out_mem[row] = std::sqrt( op_var::direct_var( dat_mem, X_n_cols, norm_type) );
}
}
}
}
//! @}
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