pkgsrc/graphics/prag/DESCR

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Prag is a simple grap(DWB) replacement. It implements an extended
subset of grap(DWB)'s input language (sorry:). You can draw several
graphs within one diagram, label it, set tick marks, use a grid, etc.
It is written in nawk(1) and you get the whole source code. It's
available via anonymous ftp service from
ftp.informatik.uni-rostock.de:/pub/local/software
Bug reports or suggested improvements should go to
hme@informatik.uni-rostock.de
Aside some simple examples you got a rudimentary manual page.
Nevertheless the source is the best documentation.
Holger Meyer