## table of contents

NAUTY-DELPTG(1) | Nauty Manual | NAUTY-DELPTG(1) |

# NAME¶

nauty-delptg - 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

- (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

November 2022 | nauty 2.8.6 |