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nauty-planarg - Man Page

test graphs for planarity and find embeddings or obstructions


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


For each input, write to output if planar.

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


Write non-planar graphs instead of planar graphs


Write report on every input


Don't write anything, just count


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


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


Suppress checking of the result


Suppress auxiliary information

This program permits multiple edges and loops


April 2024 nauty 2.8.8 Nauty Manual