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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 fn_svd
//! @{
template<typename T1>
inline
bool
svd
(
Col<typename T1::pod_type>& S,
const Base<typename T1::elem_type,T1>& X,
const typename arma_blas_type_only<typename T1::elem_type>::result* junk = nullptr
)
{
arma_extra_debug_sigprint();
arma_ignore(junk);
typedef typename T1::elem_type eT;
Mat<eT> A(X.get_ref());
const bool status = auxlib::svd_dc(S, A);
if(status == false)
{
S.soft_reset();
arma_debug_warn_level(3, "svd(): decomposition failed");
}
return status;
}
template<typename T1>
arma_warn_unused
inline
Col<typename T1::pod_type>
svd
(
const Base<typename T1::elem_type,T1>& X,
const typename arma_blas_type_only<typename T1::elem_type>::result* junk = nullptr
)
{
arma_extra_debug_sigprint();
arma_ignore(junk);
typedef typename T1::elem_type eT;
typedef typename T1::pod_type T;
Col<T> out;
Mat<eT> A(X.get_ref());
const bool status = auxlib::svd_dc(out, A);
if(status == false)
{
out.soft_reset();
arma_stop_runtime_error("svd(): decomposition failed");
}
return out;
}
template<typename T1>
inline
bool
svd
(
Mat<typename T1::elem_type>& U,
Col<typename T1::pod_type >& S,
Mat<typename T1::elem_type>& V,
const Base<typename T1::elem_type,T1>& X,
const char* method = "dc",
const typename arma_blas_type_only<typename T1::elem_type>::result* junk = nullptr
)
{
arma_extra_debug_sigprint();
arma_ignore(junk);
typedef typename T1::elem_type eT;
arma_debug_check
(
( ((void*)(&U) == (void*)(&S)) || (&U == &V) || ((void*)(&S) == (void*)(&V)) ),
"svd(): two or more output objects are the same object"
);
const char sig = (method != nullptr) ? method[0] : char(0);
arma_debug_check( ((sig != 's') && (sig != 'd')), "svd(): unknown method specified" );
Mat<eT> A(X.get_ref());
const bool status = (sig == 'd') ? auxlib::svd_dc(U, S, V, A) : auxlib::svd(U, S, V, A);
if(status == false)
{
U.soft_reset();
S.soft_reset();
V.soft_reset();
arma_debug_warn_level(3, "svd(): decomposition failed");
}
return status;
}
template<typename T1>
inline
bool
svd_econ
(
Mat<typename T1::elem_type>& U,
Col<typename T1::pod_type >& S,
Mat<typename T1::elem_type>& V,
const Base<typename T1::elem_type,T1>& X,
const char mode,
const char* method = "dc",
const typename arma_blas_type_only<typename T1::elem_type>::result* junk = nullptr
)
{
arma_extra_debug_sigprint();
arma_ignore(junk);
typedef typename T1::elem_type eT;
arma_debug_check
(
( ((void*)(&U) == (void*)(&S)) || (&U == &V) || ((void*)(&S) == (void*)(&V)) ),
"svd_econ(): two or more output objects are the same object"
);
arma_debug_check
(
( (mode != 'l') && (mode != 'r') && (mode != 'b') ),
"svd_econ(): parameter 'mode' is incorrect"
);
const char sig = (method != nullptr) ? method[0] : char(0);
arma_debug_check( ((sig != 's') && (sig != 'd')), "svd_econ(): unknown method specified" );
Mat<eT> A(X.get_ref());
const bool status = ((mode == 'b') && (sig == 'd')) ? auxlib::svd_dc_econ(U, S, V, A) : auxlib::svd_econ(U, S, V, A, mode);
if(status == false)
{
U.soft_reset();
S.soft_reset();
V.soft_reset();
arma_debug_warn_level(3, "svd_econ(): decomposition failed");
}
return status;
}
template<typename T1>
inline
bool
svd_econ
(
Mat<typename T1::elem_type>& U,
Col<typename T1::pod_type >& S,
Mat<typename T1::elem_type>& V,
const Base<typename T1::elem_type,T1>& X,
const char* mode = "both",
const char* method = "dc",
const typename arma_blas_type_only<typename T1::elem_type>::result* junk = nullptr
)
{
arma_extra_debug_sigprint();
arma_ignore(junk);
return svd_econ(U, S, V, X, ((mode != nullptr) ? mode[0] : char(0)), method);
}
//! @}
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