mirror of
https://github.com/triqs/dft_tools
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93 lines
4.0 KiB
C++
93 lines
4.0 KiB
C++
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/*******************************************************************************
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*
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* TRIQS: a Toolbox for Research in Interacting Quantum Systems
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*
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* Copyright (C) 2012 by O. Parcollet
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*
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* TRIQS is free software: you can redistribute it and/or modify it under the
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* terms of the GNU General Public License as published by the Free Software
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* Foundation, either version 3 of the License, or (at your option) any later
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* version.
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*
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* TRIQS is distributed in the hope that it will be useful, but WITHOUT ANY
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* WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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* FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
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* details.
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*
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* You should have received a copy of the GNU General Public License along with
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* TRIQS. If not, see <http://www.gnu.org/licenses/>.
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*
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******************************************************************************/
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#ifndef TRIQS_ARRAYS_BLAS_LAPACK_GELSS_H
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#define TRIQS_ARRAYS_BLAS_LAPACK_GELSS_H
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#include <complex>
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#include "./tools.hpp"
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#include "./qcache.hpp"
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namespace triqs { namespace arrays { namespace lapack {
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using namespace blas_lapack_tools;
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namespace f77 { // overload
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extern "C" {
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void TRIQS_FORTRAN_MANGLING(dgelss) (const int &, const int &, const int &, double[], const int &, double[], const int &,
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double[], const double &, int &, double[], const int &, int &);
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void TRIQS_FORTRAN_MANGLING(zgelss) (const int &, const int &, const int &, std::complex<double>[], const int &, std::complex<double>[], const int &,
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double[], const double &, int &, std::complex<double>[], const int &, double[], int &);
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}
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inline void gelss (const int & M, const int & N, const int & NRHS, double* A, const int & LDA, double* B, const int & LDB,
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double* S, const double & RCOND, int & RANK, double* WORK, const int & LWORK, int & INFO) {
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TRIQS_FORTRAN_MANGLING(dgelss)(M,N,NRHS,A,LDA,B,LDB,S,RCOND,RANK,WORK,LWORK,INFO);
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}
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inline void gelss (const int & M, const int & N, const int & NRHS, std::complex<double>* A, const int & LDA, std::complex<double>* B, const int & LDB,
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double* S, const double & RCOND, int & RANK, std::complex<double>* WORK, const int & LWORK, double* RWORK, int & INFO) {
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TRIQS_FORTRAN_MANGLING(zgelss)(M,N,NRHS,A,LDA,B,LDB,S,RCOND,RANK,WORK,LWORK,RWORK,INFO);
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}
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}//namespace
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/**
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* Calls gelss on a matrix or view
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* Takes care of making temporary copies if necessary
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*/
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template<typename MTA, typename MTB, typename VCS>
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typename std::enable_if<
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is_blas_lapack_type<typename MTA::value_type>::value &&
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is_blas_lapack_type<typename MTB::value_type>::value &&
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is_blas_lapack_type<typename VCS::value_type>::value &&
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std::is_same<typename MTA::value_type, double>::value, int >::type //for double; driver for std::complex<double> needs to be added
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gelss (MTA & A, MTB & B, VCS & S, double rcond, int & rank, bool assert_fortran_order = true ) {
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if (assert_fortran_order && (A.memory_layout_is_c()|| B.memory_layout_is_c() )) TRIQS_RUNTIME_ERROR<< "matrix passed to getrf is not in Fortran order";
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reflexive_qcache<MTA> Ca(A);
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reflexive_qcache<MTB> Cb(B);
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auto dm = std::min(first_dim(Ca()), second_dim(Ca()));
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if (S.size() < dm) S.resize(dm);
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reflexive_qcache<VCS> Cs(S);
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int info;
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int nrhs=get_n_cols(Cb());
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typename MTA::value_type work1[1];
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// first call to get the optimal lwork
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f77::gelss ( get_n_rows(Ca()), get_n_cols(Ca()), nrhs , Ca().data_start(), get_ld(Ca()),
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Cb().data_start(), get_ld(Cb()), Cs().data_start(), rcond, rank, work1, -1, info);
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int lwork = r_round(work1[0]);
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arrays::vector<typename MTA::value_type> work(lwork);
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f77::gelss ( get_n_rows(Ca()), get_n_cols(Ca()), nrhs , Ca().data_start(), get_ld(Ca()),
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Cb().data_start(), get_ld(Cb()), Cs().data_start(), rcond, rank, work.data_start(), lwork, info);
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return info;
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}
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}}}// namespace
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#endif
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