nauty-delptg - Man Page

delete vertices

Synopsis

delptg [-lq] [-a|-b] [-d#|-d#:#] [-v#|-v#:#] [-r#] [-n#] [-m#|-i] [infile [outfile]]

Description

Delete some vertices from a file of graphs.

The output file has a header if and only if the input file does. No isomorph reduction is done.

-l

Canonically label outputs

-d# -d#:# Only remove vertices with original degree in the given range

For digraphs, the out-degree is used.

-n# The number of vertices to delete (default 1).

-v# -v#:# Vertex number or numbers that it is allowed to delete

(the first vertex is number 0).

-m# Lower bound on minimum degree of output graphs.

-r# Choose # random sets of points (not necessarily different)

-a

The deleted points must be adjacent.

-b

The deleted points must be non-adjacent.

-i

Leave deleted vertices as isolates, not compatible with -m.

No empty graphs are output. No warning is issued if

-d, -v -n, -m together imply no graphs are output.

For digraphs, out-degree is used for -d and -m. -q  Suppress auxiliary information

Info

January 2024 nauty 2.8.8 Nauty Manual