getfem_partial_mesh_fem.h

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/* -*- c++ -*- (enables emacs c++ mode) */
/*===========================================================================
 
 Copyright (C) 2006-2026 Yves Renard, Julien Pommier
 
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/**@file getfem_partial_mesh_fem.h
   @author Yves Renard <Yves.Renard@insa-lyon.fr>,
   @author Julien Pommier <Julien.Pommier@insa-toulouse.fr>
   @date June 08, 2006.
   @brief a subclass of getfem::mesh_fem which allows to eliminate a number
          of dof of the original mesh_fem.
 
   This elimination is done via the pseudo-fem getfem::partial_fem,
   hence it is not very efficient.
*/
 
#ifndef GETFEM_PARTIAL_MESH_FEM_H__
#define GETFEM_PARTIAL_MESH_FEM_H__
 
#include "getfem_mesh_fem.h"
#include "getfem_mesh_im.h"
 
 
namespace getfem {
  /**
     a subclass of mesh_fem which allows to eliminate a number of dof
     of the original mesh_fem.
  */
  class partial_mesh_fem : public mesh_fem {
  protected :
    const mesh_fem &mf;
    mutable bool is_adapted;
 
  public :
    void update_from_context(void) const
    { mf.context_check(); is_adapted = false; }
 
    /** build the mesh_fem keeping only the dof of the original
        mesh_fem which are listed in kept_dof. */
    void adapt(const dal::bit_vector &kept_dof,
               const dal::bit_vector &rejected_elt = dal::bit_vector());
    void clear(void);
 
    pfem fem_of_element(size_type cv) const
    { return  mf.fem_of_element(cv); }
 
    virtual dim_type get_qdim() const { return mf.get_qdim(); }
    virtual const bgeot::multi_index &get_qdims() const
    { return mf.get_qdims(); }
 
    virtual bool is_uniform() const { return mf.is_uniform(); }
    virtual bool is_uniformly_vectorized() const
    { return mf.is_uniformly_vectorized(); }
 
    virtual void set_qdim(dim_type) {
      GMM_ASSERT1(false, "The Qdim of a partial_mesh_fem is the same as "
                  "the original fem");
    }
 
    virtual void set_qdim(dim_type, dim_type) {
      GMM_ASSERT1(false, "The Qdim of a partial_mesh_fem is the same as "
                  "the original fem");
    }
 
    virtual void set_qdim(dim_type, dim_type, dim_type, dim_type) {
      GMM_ASSERT1(false, "The Qdim of a partial_mesh_fem is the same as "
                  "the original fem");
    }
 
    virtual void set_qdim(const bgeot::multi_index &) {
      GMM_ASSERT1(false, "The Qdim of a partial_mesh_fem is the same as "
                  "the original fem");
    }
 
    const mesh_fem &linked_mesh_fem() const { return mf; }
 
    ind_dof_ct ind_basic_dof_of_element(size_type cv) const
    { return  mf.ind_basic_dof_of_element(cv); }
 
    const std::vector<size_type> &
    ind_scalar_basic_dof_of_element(size_type cv) const
    { return mf.ind_scalar_basic_dof_of_element(cv); }
 
    ind_dof_face_ct
    ind_basic_dof_of_face_of_element(size_type cv, short_type f) const
    { return  mf.ind_basic_dof_of_face_of_element(cv, f); }
 
    size_type nb_basic_dof_of_face_of_element(size_type cv, short_type f) const
    { return  mf.nb_basic_dof_of_face_of_element(cv, f); }
 
    size_type nb_basic_dof_of_element(size_type cv) const
    { return  mf.nb_basic_dof_of_element(cv); }
 
    base_node point_of_basic_dof(size_type cv, size_type i) const
    { return  mf.point_of_basic_dof(cv, i); }
 
    base_node point_of_basic_dof(size_type d) const
    { return  mf.point_of_basic_dof(d); }
 
    dim_type basic_dof_qdim(size_type d) const
    { return  mf.basic_dof_qdim(d); }
 
    size_type first_convex_of_basic_dof(size_type d) const
    { return mf.first_convex_of_basic_dof(d); }
 
    const mesh::ind_cv_ct &convex_to_basic_dof(size_type d) const
    { return mf.convex_to_basic_dof(d); }
 
    size_type nb_dof(void) const {
      context_check();
      return use_reduction ? gmm::mat_nrows(R_) : mf.nb_dof();
    }
 
    size_type nb_basic_dof(void) const
    { return mf.nb_basic_dof(); }
 
    dal::bit_vector basic_dof_on_region(const mesh_region &b) const
    { return mf.basic_dof_on_region(b); }
 
    // invalid function for a mesh change.
    // dal::bit_vector retrieve_kept_dofs() const;
 
    void read_from_file(std::istream &)
    { GMM_ASSERT1(false, "You cannot directly read this kind of mesh_fem"); }
    void write_to_file(std::ostream &ost) const;
    void write_to_file(const std::string &name, bool with_mesh=false) const;
 
    partial_mesh_fem(const mesh_fem &mef);
    partial_mesh_fem(const mesh_fem *mef);
 
    partial_mesh_fem(const partial_mesh_fem&) = delete;
    partial_mesh_fem& operator = (const partial_mesh_fem&) = delete;
 
  };
 
  typedef std::shared_ptr<partial_mesh_fem> ppartial_mesh_fem;
 
  /**
     @brief Return a selection of dof who contribute significantly to the
     mass-matrix that would be computed with mf and the integration method mim.
 
     P represents the dimension on what the integration method operates
     (default mf.linked_mesh().dim()).
 
     An example of use can be found in the contrib/xfem_contact/ directory.
 
     A more efficient algorithm is now present in gmm_range_basis.h
   */
  dal::bit_vector select_dofs_from_im(const mesh_fem &mf, const mesh_im &mim,
                                      unsigned P = unsigned(-1));
 
 
}  /* end of namespace getfem.                                            */
 
#endif