I am doing composition of two automaton (Actually it is a transducer). So at the of it, I want to visually represent it to analyze it.
Which is the best tool/library for the same?
People have suggested me dot and graphviz. Which is better? I am writing code in OCaml. Does that have any library to draw that?
This is an example transducer which I want to draw?
People have suggested me dot and graphviz. Which is better?
There is no better - graphviz uses graphs in the dot language as input (and output among others), and has a layout command called dot
which lays out directed graphs.
I am writing code in OCaml. Does that have any library to draw that?
I don't know OCaml, but it looks like there is ocamlgraph which is able to create the dot graphs - see also this similar question. It also looks like there are graphviz ocaml extensions available for some platforms.
This is an example transducer which I want to draw?
Not sure what the question is, but this graph looks like it has been made with graphviz.