gf_mesh_fem_set

Description

General function for modifying mesh_fem objects.

Command list

• gf_mesh_fem_set(mesh_fem MF, 'fem', fem f[, ivec CVids])

  Set the Finite Element Method. Assign a FEM f to all convexes whose #ids are listed in CVids. If CVids is not given, the integration is assigned to all convexes. See the help of gf_fem to obtain a list of available FEM methods.

• gf_mesh_fem_set(mesh_fem MF, 'classical fem', int k[, ivec CVids])

  Assign a classical (Lagrange polynomial) fem of order k to the mesh_fem. Uses FEM_PK for simplexes, FEM_QK for parallelepipeds etc.

• gf_mesh_fem_set(mesh_fem MF, 'classical discontinuous fem', int K[, @tscalar alpha[, ivec CVIDX]])

  Assigns a classical (Lagrange polynomial) discontinuous fem or order K. Similar to gf_mesh_fem_set(mesh_fem MF, 'classical fem') except that FEM_PK_DISCONTINUOUS is used. Param alpha the node inset, , where 0 implies usual dof nodes, greater values move the nodes toward the center of gravity, and 1 means that all degrees of freedom collapse on the center of gravity.

• gf_mesh_fem_set(mesh_fem MF, 'qdim', int Q)

  Change the Q dimension of the field that is interpolated by the mesh_fem. Q = 1 means that the mesh_fem describes a scalar field, Q = N means that the mesh_fem describes a vector field of dimension N.

• gf_mesh_fem_set(mesh_fem MF, 'reduction matrices', mat R, mat E)

  Set the reduction and extension matrices and valid their use.

• gf_mesh_fem_set(mesh_fem MF, 'reduction', int s)

  Set or unset the use of the reduction/extension matrices.

• gf_mesh_fem_set(mesh_fem MF, 'reduce meshfem', mat RM)

  Set reduction mesh fem This function selects the degrees of freedom of the finite element method by selecting a set of independent vectors of the matrix RM. The numer of columns of RM should corresponds to the number of degrees of fredoom of the finite element method.

• gf_mesh_fem_set(mesh_fem MF, 'dof partition', ivec DOFP)

  Change the 'dof_partition' array. DOFP is a vector holding a integer value for each convex of the mesh_fem. See gf_mesh_fem_get(mesh_fem MF, 'dof partition') for a description of "dof partition".

• gf_mesh_fem_set(mesh_fem MF, 'set partial', ivec DOFs[, ivec RCVs])

  Can only be applied to a partial mesh_fem. Change the subset of the degrees of freedom of mf. If RCVs is given, no FEM will be put on the convexes listed in RCVs.

See Also

• getfem types

Authors

Y. Collette