This is a simple function that takes the graph and converts it into a *.pgraph file for visualization in other software.
An object of type
The name and location of where the *.pgraph file is to be saved. If ommitted, this function will return a single text file.
Nothing if passed a file or the raw text of the *.pgraph file if you do not provide a file object.
Rodney J. Dyer <email@example.com>
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