horizontal tree with graphviz_layout

问题

in python, with networkx. I can plot a vertical tree with :

   g=nx.balanced_tree(2,4)
   pos = nx.graphviz_layout(g, prog='dot')
   nx.draw(g,pos,labels=b_all, node_size=500)
   plt.show()

similar to

   [root]
     |
  |      |
 node   node

how I can plot a horizontal tree ?

        -- node
[root] - 
        -- node

回答1:

Pass -Grankdir=LR option to dot:

pos = nx.graphviz_layout(G, prog='dot', args="-Grankdir=LR")

http://www.graphviz.org/content/command-line-invocation

http://www.graphviz.org/content/attrs#drankdir

来源：https://stackoverflow.com/questions/17204242/horizontal-tree-with-graphviz-layout