mirror of
https://github.com/triqs/dft_tools
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72 lines
3.1 KiB
C++
72 lines
3.1 KiB
C++
/*******************************************************************************
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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_GETRI_H
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#define TRIQS_ARRAYS_BLAS_LAPACK_GETRI_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(dgetri) (const int & , double *, const int & ,int *,double *,const int & ,int & );
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void TRIQS_FORTRAN_MANGLING(zgetri) (const int & , std::complex<double> *, const int & ,int *,std::complex<double> *,const int & ,int & );
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}
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inline void getri (const int & N, double* A, const int & LDA, int * ipiv, double * work, const int & lwork, int & info) {
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TRIQS_FORTRAN_MANGLING(dgetri)(N,A,LDA,ipiv,work, lwork, info);
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}
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inline void getri (const int & N, std::complex<double>* A, const int & LDA, int * ipiv, std::complex<double> * work, const int & lwork, int & info) {
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TRIQS_FORTRAN_MANGLING(zgetri)(N,A,LDA,ipiv,work, lwork, info);
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}
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}
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inline size_t r_round(double x) { return std::round(x);}
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inline size_t r_round(std::complex<double> x) { return std::round(std::real(x));}
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/**
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* Calls getri 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 MT>
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typename std::enable_if< is_blas_lapack_type<typename MT::value_type>::value, int >::type
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getri (MT & A, arrays::vector<int> & ipiv) {
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//getri (MT & A, arrays::vector<int> & ipiv, arrays::vector<typename MT::value_type> & work ) {
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reflexive_qcache<MT> Ca(A);
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auto dm = std::min(first_dim(Ca()), second_dim(Ca()));
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if (ipiv.size() < dm) TRIQS_RUNTIME_ERROR << "getri : error in ipiv size : found "<<ipiv.size()<< " while it should be at least" << dm;
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int info;
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typename MT::value_type work1[2];
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// first call to get the optimal lwork
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f77::getri ( get_n_rows(Ca()), Ca().data_start(), get_ld(Ca()), ipiv.data_start(), work1, -1, info);
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int lwork = r_round(work1[0]);
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//std::cerr << " Optimisation lwork "<< lwork<< std::endl;
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arrays::vector<typename MT::value_type> work(lwork);
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f77::getri ( get_n_rows(Ca()), Ca().data_start(), get_ld(Ca()), ipiv.data_start(), 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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