libMesh
meshnorm.C
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1 // The libMesh Finite Element Library.
2 // Copyright (C) 2002-2017 Benjamin S. Kirk, John W. Peterson, Roy H. Stogner
3 
4 // This library is free software; you can redistribute it and/or
5 // modify it under the terms of the GNU Lesser General Public
6 // License as published by the Free Software Foundation; either
7 // version 2.1 of the License, or (at your option) any later version.
8 
9 // This library is distributed in the hope that it will be useful,
10 // but WITHOUT ANY WARRANTY; without even the implied warranty of
11 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 // Lesser General Public License for more details.
13 
14 // You should have received a copy of the GNU Lesser General Public
15 // License along with this library; if not, write to the Free Software
16 // Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
17 
18 
19 
20 // Open the mesh and solution file named on standard input, find all
21 // variables therein, and output their norms and seminorms.
22 #include "libmesh/libmesh.h"
23 
24 #include "libmesh/mesh.h"
25 #include "libmesh/equation_systems.h"
26 
27 using namespace libMesh;
28 
29 void output_norms(const System & sys, const NumericVector<Number> & vec, const std::string & vecname)
30 {
31  for (unsigned int k = 0; k != sys.n_vars(); ++k)
32  {
33  libMesh::out << "Norms in system " << sys.name() <<
34  ", vector " << vecname <<
35  ", variable " << sys.variable_name(k) << ":" << std::endl;
36  Real l1_vecnorm = sys.calculate_norm(vec, k, DISCRETE_L1);
37  libMesh::out << "l1 norm: " << l1_vecnorm << std::endl;
38  if (l1_vecnorm)
39  {
40  libMesh::out << "l2 norm: " << sys.calculate_norm(vec, k, DISCRETE_L2) << std::endl;
41  libMesh::out << "linf norm: " << sys.calculate_norm(vec, k, DISCRETE_L_INF) << std::endl;
42  libMesh::out << "H1 norm: " << sys.calculate_norm(vec, k, H1) << std::endl;
43  libMesh::out << "L1 norm: " << sys.calculate_norm(vec, k, L1) << std::endl;
44  libMesh::out << "L2 norm: " << sys.calculate_norm(vec, k, L2) << std::endl;
45  libMesh::out << "Linf norm: " << sys.calculate_norm(vec, k, L_INF) << std::endl;
46  libMesh::out << "H1 seminorm: " << sys.calculate_norm(vec, k, H1_SEMINORM) << std::endl;
47  libMesh::out << "H1 norm: " << sys.calculate_norm(vec, k, H1) << std::endl;
48  }
49  }
50 }
51 
52 int main(int argc, char ** argv)
53 {
54  LibMeshInit init (argc, argv);
55 
56  Mesh mesh(init.comm());
58 
59  libMesh::out << "Usage: " << argv[0]
60  << " mesh solution" << std::endl;
61 
62  libMesh::out << "Loading..." << std::endl;
63 
64  mesh.read(argv[1]);
65  libMesh::out << "Loaded mesh " << argv[1] << std::endl;
66  mesh.print_info();
67 
68  es.read(argv[2], EquationSystems::READ_HEADER |
72  libMesh::out << "Loaded solution " << argv[2] << std::endl;
73  es.print_info();
74 
76 
77  for (unsigned int i = 0; i != es.n_systems(); ++i)
78  {
79  System & sys = es.get_system(i);
80 
81  output_norms(sys, *sys.solution, std::string("solution"));
82  for (unsigned int j = 0; j != sys.n_vectors(); ++j)
83  output_norms(sys, sys.get_vector(j), sys.vector_name(j));
84  }
85 }
This is the EquationSystems class.
const std::string & variable_name(const unsigned int i) const
Definition: system.h:2134
ImplicitSystem & sys
MeshBase & mesh
The LibMeshInit class, when constructed, initializes the dependent libraries (e.g.
Definition: libmesh.h:62
The libMesh namespace provides an interface to certain functionality in the library.
const std::string & name() const
Definition: system.h:1998
int main(int argc, char **argv)
Definition: meshnorm.C:52
This is the base class for classes which contain information related to any physical process that mig...
Definition: system.h:76
void init(triangulateio &t)
Initializes the fields of t to NULL/0 as necessary.
const Parallel::Communicator & comm() const
Definition: libmesh.h:81
UniquePtr< NumericVector< Number > > solution
Data structure to hold solution values.
Definition: system.h:1523
void output_norms(const System &sys, const NumericVector< Number > &vec, const std::string &vecname)
Definition: meshnorm.C:29
const NumericVector< Number > & get_vector(const std::string &vec_name) const
Definition: system.C:794
Real calculate_norm(const NumericVector< Number > &v, unsigned int var, FEMNormType norm_type, std::set< unsigned int > *skip_dimensions=libmesh_nullptr) const
Definition: system.C:1383
DIE A HORRIBLE DEATH HERE typedef LIBMESH_DEFAULT_SCALAR_TYPE Real
OStreamProxy out
unsigned int n_vars() const
Definition: system.h:2086
The Mesh class is a thin wrapper, around the ReplicatedMesh class by default.
Definition: mesh.h:50
virtual void read(const std::string &name, void *mesh_data=libmesh_nullptr, bool skip_renumber_nodes_and_elements=false, bool skip_find_neighbors=false)=0
Interfaces for reading/writing a mesh to/from a file.
void print_info(std::ostream &os=libMesh::out) const
Prints relevant information about the mesh.
Definition: mesh_base.C:448
const std::string & vector_name(const unsigned int vec_num) const
Definition: system.C:852
std::streamsize precision() const
Get the associated write precision.
unsigned int n_vectors() const
Definition: system.h:2214