---
name: "geo_element"
section: "7rheolef"
platform: "linux"
package: "librheolef-dev"
version: "7.0-2+b1"
release: "Debian 10 (Buster)"
platforms: ["linux"]
url: "https://new.carta.tech/geo_element/7rheolef"
---

# geo\_element(7rheolef)

element of a mesh

## NAME

**geo\_element** - element of a mesh

## DESCRIPTION

Defines geometrical elements and sides as a set of vertice and edge indexes. This element is obtained after a Piola transformation from a reference element (see reference\_element(2)). Indexes are related to arrays of edges and vertices. These arrays are included in the description of the mesh. Thus, this class is related of a given mesh instance (see geo(2)).

## EXAMPLE

This is the test of geo\_element:

```
    geo_element_auto<> K;
    K.set_name('t') ;
    cout << "n_vertices: " << K.size()      << endl
         << "n_edges   : " << K.n_edges()   << endl
         << "dimension : " << K.dimension() << endl << endl;
    for(geo_element::size_type i = 0; i < K.size(); i++)
        K[i] = i*10 ;
    for(geo_element::size_type i = 0; i < K.n_edges(); i++)
        K.set_edge(i, i*10+5) ;
    cout << "vertices: local -> global" << endl;
    for (geo_element::size_type vloc = 0; vloc < K.size(); vloc++)
        cout << vloc << "-> " << K[vloc] << endl;
    cout << endl
         << "edges: local -> global" << endl;
    for (geo_element::size_type eloc = 0; eloc < K.n_edges(); eloc++) {
        geo_element::size_type vloc1 = subgeo_local_vertex(1, eloc, 0);
        geo_element::size_type vloc2 = subgeo_local_vertex(1, eloc, 1);
        cout << eloc << "-> " << K.edge(eloc) << endl
             << "local_vertex_from_edge(" << eloc
             << ") -> (" << vloc1 << ", " << vloc2 << ")" << endl;
    }

```

## SEE ALSO

reference\_element(2), geo(2)

## COPYRIGHT

Copyright (C) 2000-2018 Pierre Saramito \<Pierre.Saramito@imag.fr\> GPLv3+: GNU GPL version 3 or later \<http://gnu.org/licenses/gpl.html\>. This is free software: you are free to change and redistribute it.  There is NO WARRANTY, to the extent permitted by law.