---
name: "nauty-complg"
section: "1"
platform: "linux"
package: "nauty"
version: "2.8.9+ds-1+b1"
release: "Debian 13 (Trixie)"
platforms: ["linux"]
url: "https://new.carta.tech/nauty-complg"
---

# nauty-complg(1)

complement graphs

## NAME

nauty-complg - complement graphs

## SYNOPSIS

**complg** \[*-lq*\] \[*-a*\] \[*-L*\] \[*-r\|-R*\] \[*infile* \[*outfile*\]\]

## DESCRIPTION

-

  Take the complements 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.

- **-r**

  Only complement if the complement has fewer directed edges.

- **-R**

  Only complement if the complement has fewer directed edges or has the same number of directed edges and is canonically less than the original.

- **-a**

  Also output the input graph (before the complement).

- **-L**

  Complement the loops too. By default, preserve them.

- **-l**

  Canonically label outputs.

- **-q**

  Suppress auxiliary information.