NAUTY-SHORTG(1) Nauty Manual NAUTY-SHORTG(1)
NAME
nauty-shortg - remove isomorphs from a file of graphs
SYNOPSIS
shortg [-qvkdu] [-i# -I#:# -K#] [-fxxx] [-S|-t] [-Tdir] [infile [out-
file]]
DESCRIPTION
Remove isomorphs from a file of graphs.
If outfile is omitted, it is taken to be the same as infile If
both infile and outfile are omitted, input will be taken
from stdin and written to stdout
The output file has a header if and only if the input file does.
-s force output to sparse6 format
-g force output to graph6 format
-z force output to digraph6 format If none of -s, -z, -g are given,
the output format is determined by the header or, if there is
none, by the format of the first input graph. The output format
determines the sorting order too. As an exception, digraphs are
always written in digraph6 format.
-S Use sparse representation internally. Note that this changes the
canonical labelling. Multiple edges are not supported. One
loop per vertex is ok.
-t Use Traces. Note that this changes the canonical labelling.
Multiple edges,loops, directed edges are not supported, nor in-
variants.
-k output graphs have the same labelling and format as the inputs.
Without -k, output graphs have canonical labelling. -s, -g, -z
are ineffective if -k is given.
-v write to stderr a list of which input graphs correspond to which
output graphs. The input and output graphs are both numbered be-
ginning at 1. A line like
23 : 30 154 78
means that inputs 30, 154 and 78 were isomorphic, and produced
output 23.
-d include in the output only those inputs which are isomorphic to
another input. If -k is specified, all such inputs are included
in their original labelling. Without -k, only one member of
each nontrivial isomorphism class is written, with canonical la-
belling.
-fxxx Specify a partition of the point set. xxx is any
string of ASCII characters except nul.
This string is
considered extended to infinity on the right with the character
'z'. One character is associated with each point, in the order
given. The labelling used obeys these rules:
(1) the new order of the points is such that the associated
characters are in ASCII ascending order
(2) if two graphs are labelled using the same string xxx,
the output graphs are identical iff there is an associated-char-
acter-preserving isomorphism between them.
-i# select an invariant (1 = twopaths, 2 = adjtriang(K), 3 =
triples,
4 = quadruples, 5 = celltrips, 6 = cellquads, 7 = cellquins, 8 =
distances(K), 9 = indsets(K), 10 = cliques(K), 11 = cellcliq(K),
12 = cellind(K), 13 = adjacencies, 14 = cellfano, 15 = cell-
fano2, 16 = refinvar(K))
-I#:# select mininvarlevel and maxinvarlevel (default 1:1)
-K# select invararg (default 3)
-u Write no output, just report how many graphs it would have out-
put. In this case, outfile is not permitted.
-Tdir Specify that directory "dir" will be used for temporary disk
space by the sort subprocess.
The default is usually /tmp.
-q Suppress auxiliary output
nauty 2.8.6 January 2023 NAUTY-SHORTG(1)
Generated by dwww version 1.15 on Thu Jun 20 13:44:58 CEST 2024.