Here is an example of the graph 2x - 3y:
You can see how this would be written in different formats:
There are some more examples in the d3, dot, and csv directories.
To run the dot examples, you must first brew install dot
To run the python examples, you must first pip install -r requirements.txt
You can visualise the examples by running e.g.:
./dot-to-png.sh dot/coloured_graph.dot
python plot-csv.py coloured-graph