[Haskell-cafe] Program for displaying graph state in lambda interpreter?

Ertugrul Söylemez es at ertes.de
Sat Jun 2 14:31:56 CEST 2012

Benjamin Redelings <benjamin.redelings at duke.edu> wrote:

>      However, it would be nice to know of any programs that are better
> suited for this.  For example, if I could write <>*<> and draw arrows
> from the placeholders "<>" to the memory location being referenced,
> that would be easier to read.  This is done here
> http://en.wikibooks.org/wiki/Haskell/Graph_reduction to illustrate
> that 'square (1+2)' doesn't evaluate 1+2 twice.  Any ideas?

Have a look at Brent Yorgey's 'diagrams' package:


It does not do the automatic balancing that Graphviz does, but is a nice
generic drawing library for diagrams.  In particular I assume that the
initial graph of your programs is actually a tree, for which diagrams
should be very well suitable.


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