GRF files
Read and Write Utilities

GRF_IO is a FORTRAN90 library which reads or writes a GRF file containing information about an abstract graph.

The file includes information about


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


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

Related Data and Programs:

FLOYD, a FORTRAN90 library which implements Floyd's algorithm for finding the shortest distance between pairs of nodes on a directed graph.

GRAFFITI, a dataset directory which contains 195 abstract graphs, with adjacency and embedding information, stored in the GRF format.

GRAPH_REPRESENTATION, a data directory which contains examples of ways of representing abstract mathematical graphs

GRF, a data directory which contains a description of the GRF format and some examples.

GRF_DISPLAY, a MATLAB program which reads a GRF file defining a mathematical graph and displays it in the MATLAB graphics window.

GRF_DISPLAY_OPENGL, a C++ program which reads a GRF file defining a mathematical graph and displays it in an OpenGL graphics window.

GRF_TO_EPS, a FORTRAN90 program which can make an encapsulated PostScript image of a GRF file.

GRF_TO_XYL, a FORTRAN90 program which converts information describing the adjacency and embedding of an abstract graph from GRF to XYL format.


  1. Peter Eades, Ian Fogg, David Kelly,
    SPREMB: A System for Developing Graph Algorithms,
    Congressus Numerantium,
    Volume 66, December 1988.
  2. Stephen Skiena,
    Implementing Discrete Mathematics: Combinatorics and Graph Theory in Mathematica,
    Addison Wesley, 1990.
    the COMBINATORICA web page.

Source Code:

Examples and Tests:

List of Routines:

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

Last revised on 12 January 2009.