AnalysisSystemForRadionucli.../include/armadillo_bits/op_min_meat.hpp

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// Copyright (C) 2008-2015 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_min
//! @{
template<typename T1>
inline
void
op_min::apply(Mat<typename T1::elem_type>& out, const Op<T1,op_min>& in)
{
arma_extra_debug_sigprint();
typedef typename T1::elem_type eT;
const uword dim = in.aux_uword_a;
arma_debug_check( (dim > 1), "min(): parameter 'dim' must be 0 or 1");
const unwrap<T1> U(in.m);
const Mat<eT>& X = U.M;
if(&out != &X)
{
op_min::apply_noalias(out, X, dim);
}
else
{
Mat<eT> tmp;
op_min::apply_noalias(tmp, X, dim);
out.steal_mem(tmp);
}
}
template<typename eT>
inline
void
op_min::apply_noalias(Mat<eT>& out, const Mat<eT>& X, const uword dim, const typename arma_not_cx<eT>::result* junk)
{
arma_extra_debug_sigprint();
arma_ignore(junk);
const uword X_n_rows = X.n_rows;
const uword X_n_cols = X.n_cols;
if(dim == 0)
{
arma_extra_debug_print("op_min::apply(): dim = 0");
out.set_size((X_n_rows > 0) ? 1 : 0, X_n_cols);
if(X_n_rows == 0) { return; }
eT* out_mem = out.memptr();
for(uword col=0; col<X_n_cols; ++col)
{
out_mem[col] = op_min::direct_min( X.colptr(col), X_n_rows );
}
}
else
if(dim == 1)
{
arma_extra_debug_print("op_min::apply(): dim = 1");
out.set_size(X_n_rows, (X_n_cols > 0) ? 1 : 0);
if(X_n_cols == 0) { return; }
eT* out_mem = out.memptr();
arrayops::copy(out_mem, X.colptr(0), X_n_rows);
for(uword col=1; col<X_n_cols; ++col)
{
const eT* col_mem = X.colptr(col);
for(uword row=0; row<X_n_rows; ++row)
{
const eT col_val = col_mem[row];
if(col_val < out_mem[row]) { out_mem[row] = col_val; }
}
}
}
}
template<typename eT>
inline
void
op_min::apply_noalias(Mat<eT>& out, const Mat<eT>& X, const uword dim, const typename arma_cx_only<eT>::result* junk)
{
arma_extra_debug_sigprint();
arma_ignore(junk);
const uword X_n_rows = X.n_rows;
const uword X_n_cols = X.n_cols;
if(dim == 0)
{
arma_extra_debug_print("op_min::apply(): dim = 0");
out.set_size((X_n_rows > 0) ? 1 : 0, X_n_cols);
if(X_n_rows == 0) { return; }
eT* out_mem = out.memptr();
for(uword col=0; col<X_n_cols; ++col)
{
out_mem[col] = op_min::direct_min( X.colptr(col), X_n_rows );
}
}
else
if(dim == 1)
{
arma_extra_debug_print("op_min::apply(): dim = 1");
out.set_size(X_n_rows, (X_n_cols > 0) ? 1 : 0);
if(X_n_cols == 0) { return; }
eT* out_mem = out.memptr();
for(uword row=0; row<X_n_rows; ++row)
{
out_mem[row] = op_min::direct_min( X, row );
}
}
}
template<typename eT>
arma_pure
inline
eT
op_min::direct_min(const eT* const X, const uword n_elem)
{
arma_extra_debug_sigprint();
eT min_val = priv::most_pos<eT>();
uword i,j;
for(i=0, j=1; j<n_elem; i+=2, j+=2)
{
const eT X_i = X[i];
const eT X_j = X[j];
if(X_i < min_val) { min_val = X_i; }
if(X_j < min_val) { min_val = X_j; }
}
if(i < n_elem)
{
const eT X_i = X[i];
if(X_i < min_val) { min_val = X_i; }
}
return min_val;
}
template<typename eT>
inline
eT
op_min::direct_min(const eT* const X, const uword n_elem, uword& index_of_min_val)
{
arma_extra_debug_sigprint();
eT min_val = priv::most_pos<eT>();
uword best_index = 0;
uword i,j;
for(i=0, j=1; j<n_elem; i+=2, j+=2)
{
const eT X_i = X[i];
const eT X_j = X[j];
if(X_i < min_val)
{
min_val = X_i;
best_index = i;
}
if(X_j < min_val)
{
min_val = X_j;
best_index = j;
}
}
if(i < n_elem)
{
const eT X_i = X[i];
if(X_i < min_val)
{
min_val = X_i;
best_index = i;
}
}
index_of_min_val = best_index;
return min_val;
}
template<typename eT>
inline
eT
op_min::direct_min(const Mat<eT>& X, const uword row)
{
arma_extra_debug_sigprint();
const uword X_n_cols = X.n_cols;
eT min_val = priv::most_pos<eT>();
uword i,j;
for(i=0, j=1; j < X_n_cols; i+=2, j+=2)
{
const eT tmp_i = X.at(row,i);
const eT tmp_j = X.at(row,j);
if(tmp_i < min_val) { min_val = tmp_i; }
if(tmp_j < min_val) { min_val = tmp_j; }
}
if(i < X_n_cols)
{
const eT tmp_i = X.at(row,i);
if(tmp_i < min_val) { min_val = tmp_i; }
}
return min_val;
}
template<typename eT>
inline
eT
op_min::min(const subview<eT>& X)
{
arma_extra_debug_sigprint();
if(X.n_elem == 0)
{
arma_debug_check(true, "min(): object has no elements");
return Datum<eT>::nan;
}
const uword X_n_rows = X.n_rows;
const uword X_n_cols = X.n_cols;
eT min_val = priv::most_pos<eT>();
if(X_n_rows == 1)
{
const Mat<eT>& A = X.m;
const uword start_row = X.aux_row1;
const uword start_col = X.aux_col1;
const uword end_col_p1 = start_col + X_n_cols;
uword i,j;
for(i=start_col, j=start_col+1; j < end_col_p1; i+=2, j+=2)
{
const eT tmp_i = A.at(start_row, i);
const eT tmp_j = A.at(start_row, j);
if(tmp_i < min_val) { min_val = tmp_i; }
if(tmp_j < min_val) { min_val = tmp_j; }
}
if(i < end_col_p1)
{
const eT tmp_i = A.at(start_row, i);
if(tmp_i < min_val) { min_val = tmp_i; }
}
}
else
{
for(uword col=0; col < X_n_cols; ++col)
{
min_val = (std::min)(min_val, op_min::direct_min(X.colptr(col), X_n_rows));
}
}
return min_val;
}
template<typename T1>
inline
typename arma_not_cx<typename T1::elem_type>::result
op_min::min(const Base<typename T1::elem_type,T1>& X)
{
arma_extra_debug_sigprint();
typedef typename T1::elem_type eT;
const Proxy<T1> P(X.get_ref());
const uword n_elem = P.get_n_elem();
if(n_elem == 0)
{
arma_debug_check(true, "min(): object has no elements");
return Datum<eT>::nan;
}
eT min_val = priv::most_pos<eT>();
if(Proxy<T1>::prefer_at_accessor == false)
{
typedef typename Proxy<T1>::ea_type ea_type;
ea_type A = P.get_ea();
uword i,j;
for(i=0, j=1; j<n_elem; i+=2, j+=2)
{
const eT tmp_i = A[i];
const eT tmp_j = A[j];
if(tmp_i < min_val) { min_val = tmp_i; }
if(tmp_j < min_val) { min_val = tmp_j; }
}
if(i < n_elem)
{
const eT tmp_i = A[i];
if(tmp_i < min_val) { min_val = tmp_i; }
}
}
else
{
const uword n_rows = P.get_n_rows();
const uword n_cols = P.get_n_cols();
if(n_rows == 1)
{
uword i,j;
for(i=0, j=1; j < n_cols; i+=2, j+=2)
{
const eT tmp_i = P.at(0,i);
const eT tmp_j = P.at(0,j);
if(tmp_i < min_val) { min_val = tmp_i; }
if(tmp_j < min_val) { min_val = tmp_j; }
}
if(i < n_cols)
{
const eT tmp_i = P.at(0,i);
if(tmp_i < min_val) { min_val = tmp_i; }
}
}
else
{
for(uword col=0; col < n_cols; ++col)
{
uword i,j;
for(i=0, j=1; j < n_rows; i+=2, j+=2)
{
const eT tmp_i = P.at(i,col);
const eT tmp_j = P.at(j,col);
if(tmp_i < min_val) { min_val = tmp_i; }
if(tmp_j < min_val) { min_val = tmp_j; }
}
if(i < n_rows)
{
const eT tmp_i = P.at(i,col);
if(tmp_i < min_val) { min_val = tmp_i; }
}
}
}
}
return min_val;
}
template<typename T1>
inline
typename arma_not_cx<typename T1::elem_type>::result
op_min::min_with_index(const Proxy<T1>& P, uword& index_of_min_val)
{
arma_extra_debug_sigprint();
typedef typename T1::elem_type eT;
const uword n_elem = P.get_n_elem();
if(n_elem == 0)
{
arma_debug_check(true, "min(): object has no elements");
return Datum<eT>::nan;
}
eT best_val = priv::most_pos<eT>();
uword best_index = 0;
if(Proxy<T1>::prefer_at_accessor == false)
{
typedef typename Proxy<T1>::ea_type ea_type;
ea_type A = P.get_ea();
for(uword i=0; i<n_elem; ++i)
{
const eT tmp = A[i];
if(tmp < best_val) { best_val = tmp; best_index = i; }
}
}
else
{
const uword n_rows = P.get_n_rows();
const uword n_cols = P.get_n_cols();
if(n_rows == 1)
{
for(uword i=0; i < n_cols; ++i)
{
const eT tmp = P.at(0,i);
if(tmp < best_val) { best_val = tmp; best_index = i; }
}
}
else
if(n_cols == 1)
{
for(uword i=0; i < n_rows; ++i)
{
const eT tmp = P.at(i,0);
if(tmp < best_val) { best_val = tmp; best_index = i; }
}
}
else
{
uword count = 0;
for(uword col=0; col < n_cols; ++col)
for(uword row=0; row < n_rows; ++row)
{
const eT tmp = P.at(row,col);
if(tmp < best_val) { best_val = tmp; best_index = count; }
++count;
}
}
}
index_of_min_val = best_index;
return best_val;
}
template<typename T>
inline
std::complex<T>
op_min::direct_min(const std::complex<T>* const X, const uword n_elem)
{
arma_extra_debug_sigprint();
uword index = 0;
T min_val = priv::most_pos<T>();
for(uword i=0; i<n_elem; ++i)
{
const T tmp_val = std::abs(X[i]);
if(tmp_val < min_val)
{
min_val = tmp_val;
index = i;
}
}
return X[index];
}
template<typename T>
inline
std::complex<T>
op_min::direct_min(const std::complex<T>* const X, const uword n_elem, uword& index_of_min_val)
{
arma_extra_debug_sigprint();
uword index = 0;
T min_val = priv::most_pos<T>();
for(uword i=0; i<n_elem; ++i)
{
const T tmp_val = std::abs(X[i]);
if(tmp_val < min_val)
{
min_val = tmp_val;
index = i;
}
}
index_of_min_val = index;
return X[index];
}
template<typename T>
inline
std::complex<T>
op_min::direct_min(const Mat< std::complex<T> >& X, const uword row)
{
arma_extra_debug_sigprint();
const uword X_n_cols = X.n_cols;
uword index = 0;
T min_val = priv::most_pos<T>();
for(uword col=0; col<X_n_cols; ++col)
{
const T tmp_val = std::abs(X.at(row,col));
if(tmp_val < min_val)
{
min_val = tmp_val;
index = col;
}
}
return X.at(row,index);
}
template<typename T>
inline
std::complex<T>
op_min::min(const subview< std::complex<T> >& X)
{
arma_extra_debug_sigprint();
typedef typename std::complex<T> eT;
if(X.n_elem == 0)
{
arma_debug_check(true, "min(): object has no elements");
return Datum<eT>::nan;
}
const Mat<eT>& A = X.m;
const uword X_n_rows = X.n_rows;
const uword X_n_cols = X.n_cols;
const uword start_row = X.aux_row1;
const uword start_col = X.aux_col1;
const uword end_row_p1 = start_row + X_n_rows;
const uword end_col_p1 = start_col + X_n_cols;
T min_val = priv::most_pos<T>();
uword best_row = 0;
uword best_col = 0;
if(X_n_rows == 1)
{
best_col = 0;
for(uword col=start_col; col < end_col_p1; ++col)
{
const T tmp_val = std::abs( A.at(start_row, col) );
if(tmp_val < min_val)
{
min_val = tmp_val;
best_col = col;
}
}
best_row = start_row;
}
else
{
for(uword col=start_col; col < end_col_p1; ++col)
for(uword row=start_row; row < end_row_p1; ++row)
{
const T tmp_val = std::abs( A.at(row, col) );
if(tmp_val < min_val)
{
min_val = tmp_val;
best_row = row;
best_col = col;
}
}
}
return A.at(best_row, best_col);
}
template<typename T1>
inline
typename arma_cx_only<typename T1::elem_type>::result
op_min::min(const Base<typename T1::elem_type,T1>& X)
{
arma_extra_debug_sigprint();
typedef typename T1::elem_type eT;
typedef typename get_pod_type<eT>::result T;
const Proxy<T1> P(X.get_ref());
const uword n_elem = P.get_n_elem();
if(n_elem == 0)
{
arma_debug_check(true, "min(): object has no elements");
return Datum<eT>::nan;
}
T min_val = priv::most_pos<T>();
if(Proxy<T1>::prefer_at_accessor == false)
{
typedef typename Proxy<T1>::ea_type ea_type;
ea_type A = P.get_ea();
uword index = 0;
for(uword i=0; i<n_elem; ++i)
{
const T tmp = std::abs(A[i]);
if(tmp < min_val)
{
min_val = tmp;
index = i;
}
}
return( A[index] );
}
else
{
const uword n_rows = P.get_n_rows();
const uword n_cols = P.get_n_cols();
uword best_row = 0;
uword best_col = 0;
if(n_rows == 1)
{
for(uword col=0; col < n_cols; ++col)
{
const T tmp = std::abs(P.at(0,col));
if(tmp < min_val)
{
min_val = tmp;
best_col = col;
}
}
}
else
{
for(uword col=0; col < n_cols; ++col)
for(uword row=0; row < n_rows; ++row)
{
const T tmp = std::abs(P.at(row,col));
if(tmp < min_val)
{
min_val = tmp;
best_row = row;
best_col = col;
}
}
}
return P.at(best_row, best_col);
}
}
template<typename T1>
inline
typename arma_cx_only<typename T1::elem_type>::result
op_min::min_with_index(const Proxy<T1>& P, uword& index_of_min_val)
{
arma_extra_debug_sigprint();
typedef typename T1::elem_type eT;
typedef typename get_pod_type<eT>::result T;
const uword n_elem = P.get_n_elem();
if(n_elem == 0)
{
arma_debug_check(true, "min(): object has no elements");
return Datum<eT>::nan;
}
T best_val = priv::most_pos<T>();
if(Proxy<T1>::prefer_at_accessor == false)
{
typedef typename Proxy<T1>::ea_type ea_type;
ea_type A = P.get_ea();
uword best_index = 0;
for(uword i=0; i<n_elem; ++i)
{
const T tmp = std::abs(A[i]);
if(tmp < best_val) { best_val = tmp; best_index = i; }
}
index_of_min_val = best_index;
return( A[best_index] );
}
else
{
const uword n_rows = P.get_n_rows();
const uword n_cols = P.get_n_cols();
uword best_row = 0;
uword best_col = 0;
uword best_index = 0;
if(n_rows == 1)
{
for(uword col=0; col < n_cols; ++col)
{
const T tmp = std::abs(P.at(0,col));
if(tmp < best_val) { best_val = tmp; best_col = col; }
}
best_index = best_col;
}
else
if(n_cols == 1)
{
for(uword row=0; row < n_rows; ++row)
{
const T tmp = std::abs(P.at(row,0));
if(tmp < best_val) { best_val = tmp; best_row = row; }
}
best_index = best_row;
}
else
{
uword count = 0;
for(uword col=0; col < n_cols; ++col)
for(uword row=0; row < n_rows; ++row)
{
const T tmp = std::abs(P.at(row,col));
if(tmp < best_val)
{
best_val = tmp;
best_row = row;
best_col = col;
best_index = count;
}
++count;
}
}
index_of_min_val = best_index;
return P.at(best_row, best_col);
}
}
//! @}