MEDIT_TO_FEM
Convert Mesh Data from MEDIT to FEM Format.

MEDIT_TO_FEM is a FORTRAN90 program which reads a mesh file created by the MEDIT program and writes a corresponding pair of node and element files that correspond to the FEM format.

Usage:

medit_to_fem prefix

• prefix.mesh, the MEDIT file to be converted;
• prefix_nodes.txt will be the FEM node file created by the program.
• prefix_elements.txt will be the FEM element file created by the program.

Licensing:

The computer code and data files described and made available on this web page are distributed under the GNU LGPL license.

Languages:

MEDIT_TO_FEM is available in a C version and a C++ version and a FORTRAN90 version and a MATLAB version.

Related Data and Programs:

DOLFIN-CONVERT, a Python program which can convert a mesh file from Gmsh, MEDIT, METIS or SCOTCH format to an XML format suitable for use by DOLFIN or FENICS, by Anders Logg.

FEM_IO, a FORTRAN90 library which reads or writes node, element and data files defining a model associated with the finite element method (FEM).

FEM2D, a data directory which contains examples of 2D FEM files, a pair of files defining the coordinates of nodes, and the nodes that form triangular elements.

GMSH_TO_FEM, a FORTRAN90 program which reads a mesh data file created by the GMSH program and writes a pair of node and element files that correspond to the FEM format.

MEDIT, a data directory which contains examples of files which can be used by the MEDIT program to define a 2D or 3D mesh for use by the finite element method (FEM), using triangles, quadrilaterals, tetrahedrons or hexahedrons.

MEDIT, examples which illustrate the use of medit, an interactive graphics program developed to visualize numerical simulation results on unstructured meshes in two and three dimensions. Scalar, vector and tensor fields can be easily associated and displayed with meshes. The program is by Pascal Frey.

MEDIT_IO, a FORTRAN90 library which can read or write files used by the MEDIT program, which can be used to define the a mesh associated with the finite element method (FEM) in 2D or 3D, using triangles, quadrilaterals, tetrahedrons or hexahedrons.

XML_TO_FEM, a Python program which reads an XML file created by FENICS or DOLFIN, describing a mesh in 1D, 2D, or 3D, and creates corresponding FEM files, namely, a file of node coordinates, and a file of element connectivities.

Source Code:

• medit_to_fem.f90, the source code.

Examples and Tests:

CUBE86 is a 3D mesh of tetrahedrons.

• cube86.mesh, a MEDIT file.
• cube86_nodes.txt, the FEM node file created by the program.
• cube86_elements.txt, the FEM element file created by the program.

ELL is a 2D mesh of triangles.

• ell.mesh, a MEDIT file.
• ell_nodes.txt, the FEM node file created by the program.
• ell_elements.txt, the FEM element file created by the program.

List of Routines:

• MAIN is the main program for MEDIT_TO_FEM.
• CH_CAP capitalizes a single character.
• CH_EQI is a case insensitive comparison of two characters for equality.
• CH_TO_DIGIT returns the integer value of a base 10 digit.
• GET_UNIT returns a free FORTRAN unit number.
• I4MAT_WRITE writes an I4MAT file.
• MESH_DATA_READ reads data from a MESH file.
• MESH_SIZE_READ reads sizes from a MESH file.
• R8MAT_WRITE writes an R8MAT file.
• S_BEGIN is TRUE if one string matches the beginning of the other.
• S_EQI is a case insensitive comparison of two strings for equality.
• S_TO_I4 reads an I4 from a string.
• S_TO_I4VEC reads an I4VEC from a string.
• S_TO_R8 reads an R8 from a string.
• S_TO_R8VEC reads an R8VEC from a string.
• TIMESTAMP prints the current YMDHMS date as a time stamp.

You can go up one level to the FORTRAN90 source codes.