grf_io, a MATLAB code 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 MATLAB code 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 of 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 code which reads a GRF file defining a mathematical graph and displays it in the MATLAB graphics window.



  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.

Source Code:

Last revised on 24 January 2019.