|   | 1 |  initial version  | 
Like this
sage: m = matrix(ZZ,2,2,[1,1,0,1])
sage: Poset(DiGraph(m-1, loops=False))
Finite poset containing 2 elements
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                Copyright Sage, 2010. Some rights reserved under creative commons license. Content on this site is licensed under a Creative Commons Attribution Share Alike 3.0 license.