ggen

Quickstart

• brew install uv
• brew install graphviz
• brew install gnuplot
• Clone the repo
• cd into the top-level repo directory
• make
• Check out the Graphviz plots and Gnuplot histograms in the gallery subdirectory as well as the CSV files in the tests subdirectory

Background

• ggen is part of a larger suite of programs for finding induced subgraphs with a prescribed edge count.
• Among other things, ggen can generate three kinds of random graphs: "exponential" (Erdős–Rényi), "power" (scale-free) and "geometric" (in the plane, with no wrap-around).
• It is intended to be used in conjunction with sub_search and is a bit awkward to call directly.
• Moreover, the native graph representation format used by ggen and sub_search — effectively the adjacency lists corresponding to the upper-triangular portion of the adjacency matrix — is non-standard and does not lend itself to visualization or manipulation.
• This standalone repo contains a copy of ggen.c as well as ggen.sh, a friendlier wrapper for a subset of ggen's functionality. Be sure to make ggen before running ggen.sh.
• ggen.sh outputs graphs in the standard DOT format as well as optionally generating Graphviz plots and Gnuplot histograms. make create_gallery will create a bunch of these.
• There are also some additional scripts for producing CSV files suitable for validation, visualization and further processing. make test to see them in action.