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In older versions of Sage (6.3 and below), plotting a poset (or an acyclic graph with layout = "acyclic") gives a directed graph with arrows pointing up.

However, it seems like in Sage 6.4, the arrows now point down (and the bottom element appears at the top).

Is this a bug? Or are there any options I can tweak to reverse the orientation? I would expect the "correct" behaviour to be the one with the arrows pointing up; the Sage reference on layout_acyclic seems to agree.

(I noticed the discrepancy while running Sage 6.3 on the Sage Cell Server and Sage 6.4 on Sagemath Cloud)

In older versions of Sage (6.3 and below), plotting a poset (or an acyclic graph with layout = "acyclic") gives a directed graph with arrows pointing up.

However, it seems like in Sage 6.4, the arrows now point down (and the bottom element appears at the top).

Is this a bug? Or are there any options I can tweak to reverse the orientation? I would expect the "correct" behaviour to be the one with the arrows pointing up; the Sage reference on layout_acyclic seems to agree.

(I noticed the discrepancy while running Sage 6.3 on the Sage Cell Server and Sage 6.4 on Sagemath Cloud)

Poset({0:[2],1:[2],2:[]}).show()

In older versions of Sage (6.3 and below), plotting a poset (or an acyclic graph with layout = "acyclic") gives a directed graph with arrows pointing up.

However, it seems like in Sage 6.4, the arrows now point down (and the bottom element appears at the top).

Is this a bug? Or are there any options I can tweak to reverse the orientation? I would expect the "correct" behaviour to be the one with the arrows pointing up; the Sage reference on layout_acyclic seems to agree.

(I noticed the discrepancy while running Sage 6.3 on the Sage Cell Server and Sage 6.4 on Sagemath Cloud)

Here's some code you can try:

Poset({0:[2],1:[2],2:[]}).show()