pickg(1)
NAME
pickg - countg : Count graphs according to their properties.
SYNOPSIS
[pickg|countg] [-fp#:#q -V] [--keys] [-constraints -v] [ifile [ofile]]
DESCRIPTION
countg : Count graphs according to their properties.
pickg : Select graphs according to their properties.
ifile, ofile : Input and output files.
'-' and missing names imply stdin and stdout.
- Miscellaneous switches:
- -p# -p#:#
- Specify range of input lines (first is 1)
- -f With -p, assume input lines of fixed length (only used with a
- file in graph6 format)
- -v Negate all constraints
- -V List properties of every input matching constraints.
- -q Suppress informative output.
Constraints:- Numerical constraints (shown here with following #) can take a single integer value, or a range like #:#, #:, or :#. Each can also be preceded by '~', which negates it. (For example, -~D2:4 will match any maximum degree which is _not_ 2, 3, or 4.) Constraints are applied to all input graphs, and only those which match all constraints are counted or selected.
- -n# number of vertices -e# number of edges
- -d# minimum degree -D# maximum degree
- -r regular -b bipartite
- -z# radius -Z# diameter
- -g# girth (0=acyclic) -Y# total number of cycles
- -T# number of triangles
- -E Eulerian (all degrees are even, connectivity not required)
- -a# group size -o# orbits -F# fixed points -t vertex-transitive
- -c# connectivity (only implemented for 0,1,2).
- -i# min common nbrs of adjacent vertices; -I# maximum
- -j# min common nbrs of non-adjacent vertices; -J# maximum
Sort keys:- Counts are made for all graphs passing the constraints.
- Counts
- are given separately for each combination of values occuring for the properties listed as sort keys. A sort key is introduced by '--' and uses one of the letters known as constraints. These can be combined: --n --e --r is the same as --ne --r and --ner. The order of sort keys is significant.