AnalysisSystemForRadionucli.../include/armadillo_bits/fn_norm.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 fn_norm
//! @{
template<typename T1>
inline
arma_warn_unused
typename enable_if2< is_arma_type<T1>::value, typename T1::pod_type >::result
norm
(
const T1& X,
const uword k = uword(2),
const typename arma_real_or_cx_only<typename T1::elem_type>::result* junk = 0
)
{
arma_extra_debug_sigprint();
arma_ignore(junk);
typedef typename T1::pod_type T;
const Proxy<T1> P(X);
if(P.get_n_elem() == 0)
{
return T(0);
}
const bool is_vec = (T1::is_row) || (T1::is_col) || (P.get_n_rows() == 1) || (P.get_n_cols() == 1);
if(is_vec)
{
switch(k)
{
case 1:
return op_norm::vec_norm_1(P);
break;
case 2:
return op_norm::vec_norm_2(P);
break;
default:
{
arma_debug_check( (k == 0), "norm(): k must be greater than zero" );
return op_norm::vec_norm_k(P, int(k));
}
}
}
else
{
switch(k)
{
case 1:
return op_norm::mat_norm_1(P);
break;
case 2:
return op_norm::mat_norm_2(P);
break;
default:
arma_stop("norm(): unsupported matrix norm type");
return T(0);
}
}
return T(0); // prevent erroneous compiler warnings
}
template<typename T1>
inline
arma_warn_unused
typename enable_if2< is_arma_type<T1>::value, typename T1::pod_type >::result
norm
(
const T1& X,
const char* method,
const typename arma_real_or_cx_only<typename T1::elem_type>::result* junk = 0
)
{
arma_extra_debug_sigprint();
arma_ignore(junk);
typedef typename T1::pod_type T;
const Proxy<T1> P(X);
if(P.get_n_elem() == 0)
{
return T(0);
}
const char sig = (method != NULL) ? method[0] : char(0);
const bool is_vec = (T1::is_row) || (T1::is_col) || (P.get_n_rows() == 1) || (P.get_n_cols() == 1);
if(is_vec)
{
if( (sig == 'i') || (sig == 'I') || (sig == '+') ) // max norm
{
return op_norm::vec_norm_max(P);
}
else
if(sig == '-') // min norm
{
return op_norm::vec_norm_min(P);
}
else
if( (sig == 'f') || (sig == 'F') )
{
return op_norm::vec_norm_2(P);
}
else
{
arma_stop("norm(): unsupported vector norm type");
return T(0);
}
}
else
{
if( (sig == 'i') || (sig == 'I') || (sig == '+') ) // inf norm
{
return op_norm::mat_norm_inf(P);
}
else
if( (sig == 'f') || (sig == 'F') )
{
return op_norm::vec_norm_2(P);
}
else
{
arma_stop("norm(): unsupported matrix norm type");
return T(0);
}
}
}
//
// norms for sparse matrices
template<typename T1>
inline
arma_warn_unused
typename enable_if2< is_arma_sparse_type<T1>::value, typename T1::pod_type >::result
norm
(
const T1& X,
const uword k = uword(2),
const typename arma_real_or_cx_only<typename T1::elem_type>::result* junk = 0
)
{
arma_extra_debug_sigprint();
arma_ignore(junk);
typedef typename T1::elem_type eT;
typedef typename T1::pod_type T;
const SpProxy<T1> P(X);
if(P.get_n_nonzero() == 0)
{
return T(0);
}
const bool is_vec = (P.get_n_rows() == 1) || (P.get_n_cols() == 1);
if(is_vec == true)
{
const unwrap_spmat<typename SpProxy<T1>::stored_type> tmp(P.Q);
const SpMat<eT>& A = tmp.M;
// create a fake dense vector to allow reuse of code for dense vectors
Col<eT> fake_vector( access::rwp(A.values), A.n_nonzero, false );
const Proxy< Col<eT> > P_fake_vector(fake_vector);
switch(k)
{
case 1:
return op_norm::vec_norm_1(P_fake_vector);
break;
case 2:
return op_norm::vec_norm_2(P_fake_vector);
break;
default:
{
arma_debug_check( (k == 0), "norm(): k must be greater than zero" );
return op_norm::vec_norm_k(P_fake_vector, int(k));
}
}
}
else
{
switch(k)
{
case 1:
return op_norm::mat_norm_1(P);
break;
case 2:
return op_norm::mat_norm_2(P);
break;
default:
arma_stop("norm(): unsupported or unimplemented norm type for sparse matrices");
return T(0);
}
}
}
template<typename T1>
inline
arma_warn_unused
typename enable_if2< is_arma_sparse_type<T1>::value, typename T1::pod_type >::result
norm
(
const T1& X,
const char* method,
const typename arma_real_or_cx_only<typename T1::elem_type>::result* junk = 0
)
{
arma_extra_debug_sigprint();
arma_ignore(junk);
typedef typename T1::elem_type eT;
typedef typename T1::pod_type T;
const SpProxy<T1> P(X);
if(P.get_n_nonzero() == 0)
{
return T(0);
}
const unwrap_spmat<typename SpProxy<T1>::stored_type> tmp(P.Q);
const SpMat<eT>& A = tmp.M;
// create a fake dense vector to allow reuse of code for dense vectors
Col<eT> fake_vector( access::rwp(A.values), A.n_nonzero, false );
const Proxy< Col<eT> > P_fake_vector(fake_vector);
const char sig = (method != NULL) ? method[0] : char(0);
const bool is_vec = (P.get_n_rows() == 1) || (P.get_n_cols() == 1); // TODO: (T1::is_row) || (T1::is_col) || ...
if(is_vec == true)
{
if( (sig == 'i') || (sig == 'I') || (sig == '+') ) // max norm
{
return op_norm::vec_norm_max(P_fake_vector);
}
else
if(sig == '-') // min norm
{
const T val = op_norm::vec_norm_min(P_fake_vector);
if( P.get_n_nonzero() < P.get_n_elem() )
{
return (std::min)(T(0), val);
}
else
{
return val;
}
}
else
if( (sig == 'f') || (sig == 'F') )
{
return op_norm::vec_norm_2(P_fake_vector);
}
else
{
arma_stop("norm(): unsupported vector norm type");
return T(0);
}
}
else
{
if( (sig == 'i') || (sig == 'I') || (sig == '+') ) // inf norm
{
return op_norm::mat_norm_inf(P);
}
else
if( (sig == 'f') || (sig == 'F') )
{
return op_norm::vec_norm_2(P_fake_vector);
}
else
{
arma_stop("norm(): unsupported matrix norm type");
return T(0);
}
}
}
//! @}