EigenVector.h

// Copyright (C) 2015 Garth N. Wells
//
// This file is part of DOLFIN.
//
// DOLFIN is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// DOLFIN is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with DOLFIN. If not, see <http://www.gnu.org/licenses/>.

#ifndef __EIGEN_VECTOR_H
#define __EIGEN_VECTOR_H

#include <memory>
#include <string>
#include <utility>
#include <vector>

#include <dolfin/common/types.h>
#include <Eigen/Dense>

#include <dolfin/common/MPI.h>
#include "GenericVector.h"

namespace dolfin
{

  template<typename T> class Array;


  class EigenVector : public GenericVector
  {
  public:

    EigenVector();

    explicit EigenVector(MPI_Comm comm);

    EigenVector(MPI_Comm comm, std::size_t N);

    EigenVector(const EigenVector& x);

    explicit EigenVector(std::shared_ptr<Eigen::VectorXd> x);

    virtual ~EigenVector();

    //--- Implementation of the GenericTensor interface ---

    virtual void zero();

    virtual void apply(std::string mode);

    virtual MPI_Comm mpi_comm() const
    { return _mpi_comm.comm(); }

    virtual std::string str(bool verbose) const;

    //--- Implementation of the GenericVector interface ---

    virtual std::shared_ptr<GenericVector> copy() const;

    virtual void init(std::size_t N)
    {
      if (!empty())
      {
        dolfin_error("EigenVector.cpp",
                     "calling EigenVector::init(...)",
                     "Cannot call init for a non-empty vector. Use EigenVector::resize instead");
      }
      resize(N);
    }

    virtual void init(std::pair<std::size_t, std::size_t> range)
    {
      if (!empty())
      {
        dolfin_error("EigenVector.cpp",
                     "calling EigenVector::init(...)",
                     "Cannot call init for a non-empty vector. Use EigenVector::resize instead");
      }

      dolfin_assert(range.first == 0);
      const std::size_t size = range.second - range.first;
      resize(size);
    }

    virtual void init(std::pair<std::size_t, std::size_t> range,
                      const std::vector<std::size_t>& local_to_global_map,
                      const std::vector<la_index>& ghost_indices)
    {
      if (!empty())
      {
        dolfin_error("EigenVector.cpp",
                     "calling EigenVector::init(...)",
                     "Cannot call init for a non-empty vector. Use EigenVector::resize instead");
      }

      if (!ghost_indices.empty())
      {
        dolfin_error("EigenVector.cpp",
                     "calling EigenVector::init(...)",
                     "EigenVector does not support ghost values");
      }

      dolfin_assert(range.first == 0);
      const std::size_t size = range.second - range.first;
      resize(size);
    }

    // Bring init function from GenericVector into scope
    using GenericVector::init;

    virtual bool empty() const;

    virtual std::size_t size() const;

    virtual std::size_t local_size() const
    { return size(); }

    virtual std::pair<std::int64_t, std::int64_t> local_range() const;

    virtual bool owns_index(std::size_t i) const;

    virtual void get(double* block, std::size_t m,
                     const dolfin::la_index* rows) const
    { get_local(block, m, rows); }

    virtual void get_local(double* block, std::size_t m,
                           const dolfin::la_index* rows) const;

    virtual void set(const double* block, std::size_t m,
                     const dolfin::la_index* rows);

    virtual void set_local(const double* block, std::size_t m,
                           const dolfin::la_index* rows)
    { set(block, m, rows); }

    virtual void add(const double* block, std::size_t m,
                     const dolfin::la_index* rows);

    virtual void add_local(const double* block, std::size_t m,
                           const dolfin::la_index* rows)
    { add(block, m, rows); }

    virtual void get_local(std::vector<double>& values) const;

    virtual void set_local(const std::vector<double>& values);

    virtual void add_local(const Array<double>& values);

    virtual void gather(GenericVector& x,
                        const std::vector<dolfin::la_index>& indices) const;

    virtual void gather(std::vector<double>& x,
                        const std::vector<dolfin::la_index>& indices) const;

    virtual void gather_on_zero(std::vector<double>& x) const;

    virtual void axpy(double a, const GenericVector& x);

    virtual void abs();

    virtual double inner(const GenericVector& x) const;

    virtual double norm(std::string norm_type) const;

    virtual double min() const;

    virtual double max() const;

    virtual double sum() const;

    virtual double sum(const Array<std::size_t>& rows) const;

    virtual const EigenVector& operator*= (double a);

    virtual const EigenVector& operator*= (const GenericVector& x);

    virtual const EigenVector& operator/= (double a);

    virtual const EigenVector& operator+= (const GenericVector& x);

    virtual const EigenVector& operator+= (double a);

    virtual const EigenVector& operator-= (const GenericVector& x);

    virtual const EigenVector& operator-= (double a);

    virtual const GenericVector& operator= (const GenericVector& x);

    virtual const EigenVector& operator= (double a);

    //--- Special functions ---

    virtual GenericLinearAlgebraFactory& factory() const;

    //--- Special Eigen functions ---

    virtual void resize(std::size_t N);

    std::shared_ptr<const Eigen::VectorXd> vec() const
    { return _x; }

    std::shared_ptr<Eigen::VectorXd> vec()
    { return _x; }

    virtual double operator[] (dolfin::la_index i) const
    { return (*_x)(i); }

    double& operator[] (dolfin::la_index i)
    { return (*_x)(i); }

    const EigenVector& operator= (const EigenVector& x);

    double* data();

    const double* data() const;

  private:

    static void check_mpi_size(const MPI_Comm comm)
    {
      if (dolfin::MPI::size(comm) > 1)
      {
        dolfin_error("EigenVector.cpp",
                     "creating EigenVector",
                     "EigenVector does not support parallel communicators");
      }
    }

    // Pointer to Eigen vector object
    std::shared_ptr<Eigen::VectorXd> _x;

    // MPI communicator
    dolfin::MPI::Comm _mpi_comm;

  };

}

#endif