AnalysisSystemForRadionucli.../include/armadillo_bits/op_fft_meat.hpp

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// Copyright (C) 2013 National ICT Australia (NICTA)
//
// This Source Code Form is subject to the terms of the Mozilla Public
// License, v. 2.0. If a copy of the MPL was not distributed with this
// file, You can obtain one at http://mozilla.org/MPL/2.0/.
// -------------------------------------------------------------------
//
// Written by Conrad Sanderson - http://conradsanderson.id.au
//! \addtogroup op_fft
//! @{
//
// op_fft_real
template<typename T1>
inline
void
op_fft_real::apply( Mat< std::complex<typename T1::pod_type> >& out, const mtOp<std::complex<typename T1::pod_type>,T1,op_fft_real>& in )
{
arma_extra_debug_sigprint();
typedef typename T1::pod_type in_eT;
typedef typename std::complex<in_eT> out_eT;
const Proxy<T1> P(in.m);
const uword n_rows = P.get_n_rows();
const uword n_cols = P.get_n_cols();
const uword n_elem = P.get_n_elem();
const bool is_vec = ( (n_rows == 1) || (n_cols == 1) );
const uword N_orig = (is_vec) ? n_elem : n_rows;
const uword N_user = (in.aux_uword_b == 0) ? in.aux_uword_a : N_orig;
fft_engine<out_eT,false> worker(N_user);
// no need to worry about aliasing, as we're going from a real object to complex complex, which by definition cannot alias
if(is_vec)
{
(n_cols == 1) ? out.set_size(N_user, 1) : out.set_size(1, N_user);
if( (out.n_elem == 0) || (N_orig == 0) )
{
out.zeros();
return;
}
if( (N_user == 1) && (N_orig >= 1) )
{
out[0] = out_eT( P[0] );
return;
}
podarray<out_eT> data(N_user);
out_eT* data_mem = data.memptr();
if(N_user > N_orig) { arrayops::fill_zeros( &data_mem[N_orig], (N_user - N_orig) ); }
const uword N = (std::min)(N_user, N_orig);
if(Proxy<T1>::prefer_at_accessor == false)
{
typename Proxy<T1>::ea_type X = P.get_ea();
for(uword i=0; i < N; ++i) { data_mem[i] = out_eT( X[i], in_eT(0) ); }
}
else
{
if(n_cols == 1)
{
for(uword i=0; i < N; ++i) { data_mem[i] = out_eT( P.at(i,0), in_eT(0) ); }
}
else
{
for(uword i=0; i < N; ++i) { data_mem[i] = out_eT( P.at(0,i), in_eT(0) ); }
}
}
worker.run( out.memptr(), data_mem );
}
else
{
// process each column seperately
out.set_size(N_user, n_cols);
if( (out.n_elem == 0) || (N_orig == 0) )
{
out.zeros();
return;
}
if( (N_user == 1) && (N_orig >= 1) )
{
for(uword col=0; col < n_cols; ++col) { out.at(0,col) = out_eT( P.at(0,col) ); }
return;
}
podarray<out_eT> data(N_user);
out_eT* data_mem = data.memptr();
if(N_user > N_orig) { arrayops::fill_zeros( &data_mem[N_orig], (N_user - N_orig) ); }
const uword N = (std::min)(N_user, N_orig);
for(uword col=0; col < n_cols; ++col)
{
for(uword i=0; i < N; ++i) { data_mem[i] = P.at(i, col); }
worker.run( out.colptr(col), data_mem );
}
}
}
//
// op_fft_cx
template<typename T1>
inline
void
op_fft_cx::apply(Mat<typename T1::elem_type>& out, const Op<T1,op_fft_cx>& in)
{
arma_extra_debug_sigprint();
typedef typename T1::elem_type eT;
const Proxy<T1> P(in.m);
if(P.is_alias(out) == false)
{
op_fft_cx::apply_noalias<T1,false>(out, P, in.aux_uword_a, in.aux_uword_b);
}
else
{
Mat<eT> tmp;
op_fft_cx::apply_noalias<T1,false>(tmp, P, in.aux_uword_a, in.aux_uword_b);
out.steal_mem(tmp);
}
}
template<typename T1, bool inverse>
inline
void
op_fft_cx::apply_noalias(Mat<typename T1::elem_type>& out, const Proxy<T1>& P, const uword a, const uword b)
{
arma_extra_debug_sigprint();
typedef typename T1::elem_type eT;
const uword n_rows = P.get_n_rows();
const uword n_cols = P.get_n_cols();
const uword n_elem = P.get_n_elem();
const bool is_vec = ( (n_rows == 1) || (n_cols == 1) );
const uword N_orig = (is_vec) ? n_elem : n_rows;
const uword N_user = (b == 0) ? a : N_orig;
fft_engine<eT,inverse> worker(N_user);
if(is_vec)
{
(n_cols == 1) ? out.set_size(N_user, 1) : out.set_size(1, N_user);
if( (out.n_elem == 0) || (N_orig == 0) )
{
out.zeros();
return;
}
if( (N_user == 1) && (N_orig >= 1) )
{
out[0] = P[0];
return;
}
if( (N_user > N_orig) || (is_Mat<typename Proxy<T1>::stored_type>::value == false) )
{
podarray<eT> data(N_user);
eT* data_mem = data.memptr();
if(N_user > N_orig) { arrayops::fill_zeros( &data_mem[N_orig], (N_user - N_orig) ); }
op_fft_cx::copy_vec( data_mem, P, (std::min)(N_user, N_orig) );
worker.run( out.memptr(), data_mem );
}
else
{
const unwrap< typename Proxy<T1>::stored_type > tmp(P.Q);
worker.run( out.memptr(), tmp.M.memptr() );
}
}
else
{
// process each column seperately
out.set_size(N_user, n_cols);
if( (out.n_elem == 0) || (N_orig == 0) )
{
out.zeros();
return;
}
if( (N_user == 1) && (N_orig >= 1) )
{
for(uword col=0; col < n_cols; ++col) { out.at(0,col) = P.at(0,col); }
return;
}
if( (N_user > N_orig) || (is_Mat<typename Proxy<T1>::stored_type>::value == false) )
{
podarray<eT> data(N_user);
eT* data_mem = data.memptr();
if(N_user > N_orig) { arrayops::fill_zeros( &data_mem[N_orig], (N_user - N_orig) ); }
const uword N = (std::min)(N_user, N_orig);
for(uword col=0; col < n_cols; ++col)
{
for(uword i=0; i < N; ++i) { data_mem[i] = P.at(i, col); }
worker.run( out.colptr(col), data_mem );
}
}
else
{
const unwrap< typename Proxy<T1>::stored_type > tmp(P.Q);
for(uword col=0; col < n_cols; ++col)
{
worker.run( out.colptr(col), tmp.M.colptr(col) );
}
}
}
// correct the scaling for the inverse transform
if(inverse == true)
{
typedef typename get_pod_type<eT>::result T;
const T k = T(1) / T(N_user);
eT* out_mem = out.memptr();
const uword out_n_elem = out.n_elem;
for(uword i=0; i < out_n_elem; ++i) { out_mem[i] *= k; }
}
}
template<typename T1>
arma_hot
inline
void
op_fft_cx::copy_vec(typename Proxy<T1>::elem_type* dest, const Proxy<T1>& P, const uword N)
{
arma_extra_debug_sigprint();
if(is_Mat< typename Proxy<T1>::stored_type >::value == true)
{
op_fft_cx::copy_vec_unwrap(dest, P, N);
}
else
{
op_fft_cx::copy_vec_proxy(dest, P, N);
}
}
template<typename T1>
arma_hot
inline
void
op_fft_cx::copy_vec_unwrap(typename Proxy<T1>::elem_type* dest, const Proxy<T1>& P, const uword N)
{
arma_extra_debug_sigprint();
const unwrap< typename Proxy<T1>::stored_type > tmp(P.Q);
arrayops::copy(dest, tmp.M.memptr(), N);
}
template<typename T1>
arma_hot
inline
void
op_fft_cx::copy_vec_proxy(typename Proxy<T1>::elem_type* dest, const Proxy<T1>& P, const uword N)
{
arma_extra_debug_sigprint();
if(Proxy<T1>::prefer_at_accessor == false)
{
typename Proxy<T1>::ea_type X = P.get_ea();
for(uword i=0; i < N; ++i) { dest[i] = X[i]; }
}
else
{
if(P.get_n_cols() == 1)
{
for(uword i=0; i < N; ++i) { dest[i] = P.at(i,0); }
}
else
{
for(uword i=0; i < N; ++i) { dest[i] = P.at(0,i); }
}
}
}
//
// op_ifft_cx
template<typename T1>
inline
void
op_ifft_cx::apply(Mat<typename T1::elem_type>& out, const Op<T1,op_ifft_cx>& in)
{
arma_extra_debug_sigprint();
typedef typename T1::elem_type eT;
const Proxy<T1> P(in.m);
if(P.is_alias(out) == false)
{
op_fft_cx::apply_noalias<T1,true>(out, P, in.aux_uword_a, in.aux_uword_b);
}
else
{
Mat<eT> tmp;
op_fft_cx::apply_noalias<T1,true>(tmp, P, in.aux_uword_a, in.aux_uword_b);
out.steal_mem(tmp);
}
}
//! @}