NAME¶

nauty-planarg - test graphs for planarity and find embeddings or obstructions

SYNOPSIS¶

planarg [-v] [-nVq] [-p|-u] [infile [outfile]]

DESCRIPTION¶

For each input, write to output if planar.

The output file has a header if and only if the input file does.

-v

Write non-planar graphs instead of planar graphs

-V

Write report on every input

-u

Don't write anything, just count

-p

Write in planar_code if planar (without -p, same format as input)

-P

Like -p but big-endian (same for <= 255 vertices)

-k

Follow each non-planar output with an obstruction in sparse6 format (implies -v, incompatible with -p)

-n

Suppress checking of the result

-q

Suppress auxiliary information

This program permits multiple edges and loops