MEDIT_TO_FEM
Convert Mesh Data from MEDIT to FEM Format.

MEDIT_TO_FEM is a C 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 C 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 C 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 C 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.c, 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 TRUE (1) if two characters are equal, disregarding case.
• CH_TO_DIGIT returns the value of a base 10 digit.
• I4MAT_WRITE writes an I4MAT file.
• I4VEC_ZERO zeroes an I4VEC.
• MESH_DATA_READ reads data from a MESH file.
• MESH_SIZE_READ reads sizes from a MESH file.
• R8MAT_WRITE writes an R8MAT file.
• R8VEC_ZERO zeroes an R8VEC.
• S_BEGIN reports whether string 1 begins with string 2.
• S_EQI reports whether two strings are equal, ignoring case.
• S_LEN_TRIM returns the length of a string to the last nonblank.
• S_NEWLINE_TO_NULL replaces carriage returns or newlines by nulls.
• S_TO_I4 reads an I4 from a string.
• S_TO_I4VEC reads an I4VEC from a string.
• S_TO_R8 reads an R8 value 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 C source codes.