---
name: "nauty-amtog"
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-amtog"
---

# nauty-amtog(1)

read graphs in matrix format

## NAME

nauty-amtog - read graphs in matrix format

## SYNOPSIS

**amtog** \[*-n#sgzhq*\] \[*-o#*\] \[*infile* \[*outfile*\]\]

## DESCRIPTION

-

  Read graphs in matrix format.

- **-n**#

  Set the initial graph order to # (no default). This can be overridden in the input.

- **-g**

  Write the output in graph6 format (default).

- **-s**

  Write the output in sparse6 format.

- **-z**

  Write the output in digraph6 format.

- **-h**

  Write a header (according to **-g** or **-s**).

- **-w**

  Don't warn about loops (which are suppressed for **-g**)

- **-q**

  Suppress auxiliary information.

- **-o**#

  Treat digit # as 1 and other digits as 0.

-

  Input consists of a sequence of commands restricted to:

- n=#

  set number of vertices (no default) The = is optional.

- m

  Matrix to follow An 'm' is also assumed if a digit is encountered.

- M

  Complement of matrix to follow (as m)

- t

  Upper triangle of matrix to follow, row by row

-

  excluding the diagonal.

- T

  Complement of upper trangle to follow (as t)

- s

  Upper triangle of matrix to follow, row by row

-

  excluding the diagonal; lower triangle is complement.

- q

  exit (optional)