1NAUTY-SHORTG(1)                  Nauty Manual                  NAUTY-SHORTG(1)
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NAME

6       nauty-shortg - remove isomorphs from a file of graphs
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SYNOPSIS

9       shortg  [-qvkdu]  [-i# -I#:# -K#] [-fxxx] [-S|-t] [-Tdir] [infile [out‐
10       file]]
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DESCRIPTION

13              Remove isomorphs from a file of graphs.
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15              If outfile is omitted, it is taken to be the same as  infile  If
16              both infile and outfile are omitted, input will be taken
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18              from stdin and written to stdout
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20              The output file has a header if and only if the input file does.
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22       -s     force output to sparse6 format
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24       -g     force output to graph6 format
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26       -z     force output to digraph6 format If none of -s, -z, -g are given,
27              the output format is determined by the header or,  if  there  is
28              none,  by the format of the first input graph. The output format
29              determines the sorting order too.  As an exception, digraphs are
30              always written in digraph6 format.
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32       -S     Use sparse representation internally. Note that this changes the
33              canonical labelling.  Multiple edges  are  not  supported.   One
34              loop per vertex is ok.
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36       -t     Use  Traces.   Note  that  this changes the canonical labelling.
37              Multiple edges,loops, directed edges are not supported, nor  in‐
38              variants.
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40       -k     output  graphs have the same labelling and format as the inputs.
41              Without -k, output graphs have canonical labelling.  -s, -g,  -z
42              are ineffective if -k is given.
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44       -v     write to stderr a list of which input graphs correspond to which
45              output graphs. The input and output graphs are both numbered be‐
46              ginning at 1.  A line like
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48              23 : 30 154 78
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50              means  that  inputs 30, 154 and 78 were isomorphic, and produced
51              output 23.
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53       -d     include in the output only those inputs which are isomorphic  to
54              another input.  If -k is specified, all such inputs are included
55              in their original labelling.  Without -k,  only  one  member  of
56              each nontrivial isomorphism class is written, with canonical la‐
57              belling.
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59       -fxxx  Specify a partition of the point set.  xxx is any
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61       string of ASCII characters except nul.
62              This string is
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64              considered extended to infinity on the right with the  character
65              'z'.   One character is associated with each point, in the order
66              given.  The labelling used obeys these rules:
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68              (1) the new order of the points is such that the associated
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70              characters are in ASCII ascending order
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72              (2) if two graphs are labelled using the same string xxx,
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74              the output graphs are identical iff there is an associated-char‐
75              acter-preserving isomorphism between them.
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77       -i#    select  an  invariant  (1  =  twopaths,  2  =  adjtriang(K), 3 =
78              triples,
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80              4 = quadruples, 5 = celltrips, 6 = cellquads, 7 = cellquins, 8 =
81              distances(K), 9 = indsets(K), 10 = cliques(K), 11 = cellcliq(K),
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83              12  =  cellind(K),  13  = adjacencies, 14 = cellfano, 15 = cell‐
84              fano2, 16 = refinvar(K))
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86       -I#:#  select mininvarlevel and maxinvarlevel (default 1:1)
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88       -K#    select invararg (default 3)
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90       -u     Write no output, just report how many graphs it would have  out‐
91              put.  In this case, outfile is not permitted.
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93       -Tdir  Specify that directory "dir" will be used for temporary disk
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95       space by the sort subprocess.
96              The default is usually /tmp.
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98       -q     Suppress auxiliary output
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102nauty 2.7.1                      January 2021                  NAUTY-SHORTG(1)