NAME

       nauty-ransubg - extract random graph/digraphs of a file of graphs

SYNOPSIS

       ransubg [-lq] [-P#|-P#/#] [-z] [-o] [-m#] [-S#] [infile [outfile]]

DESCRIPTION

              Extract random graph/digraphs of a file of graphs.

              The output file has a header if and only if the input file does.  The output format
              is defined by the header or first graph,

              but is always digraph6 if -z is used.

       -z     Treat the input as a directed graph

       -o     Treat the input as a directed graph and output an oriented graph

       -P# or -P#/#
              Specify a probability p. -P# is the same as -P1/#

       -m#    Make this many outputs for each input (default 1)

       -l     Canonically label outputs.

       -S#    Set seed for random numbers (default nondeterministic)

              Usually each edge is kept with probability p.  In the case of -o, each edge in  one
              direction only is kept

              with  probability  p.  For  edges  in  both directions, with probability p keep one
              direction randomly chosen and with probability 1-p delete  both  directions.   Thus
              -oP1 will make a random orientation of an undirected graph.

       -q     Suppress auxiliary information.