Re: [networkx-discuss] error when drawing graph: networkx.exception.NetworkXError: Node 'n12' has no position.
Dan Schult
(note that this is a string with the letter n in front)
while your position dict and nodelist have integers
to key the nodes.
The node names have to match in the graph and the position dict.
Dan
On May 26, 2010, at 6:16 PM, dowstreet wrote:
> Hi. I'm getting this error when I try to draw a graph using a
> position library:
>
> networkx.exception.NetworkXError: Node 'n12' has no position.
>
> Here's the log:
>
>>>> networkx.draw(G,pos)
> Traceback (most recent call last):
> File "<stdin>", line 1, in <module>
> File "/Library/Frameworks/Python.framework/Versions/2.5/lib/
> python2.5/site-packages/networkx-1.0.1-py2.5.egg/networkx/drawing/
> nx_pylab.py", line 126, in draw
> File "/Library/Frameworks/Python.framework/Versions/2.5/lib/
> python2.5/site-packages/networkx-1.0.1-py2.5.egg/networkx/drawing/
> nx_pylab.py", line 169, in draw_networkx
> File "/Library/Frameworks/Python.framework/Versions/2.5/lib/
> python2.5/site-packages/networkx-1.0.1-py2.5.egg/networkx/drawing/
> nx_pylab.py", line 221, in draw_networkx_nodes
> networkx.exception.NetworkXError: Node 'n12' has no position.
>>>> pos
> {0: (1, 10), 1: (0, 9), 2: (1, 9), 3: (2, 9), 4: (0, 2), 5: (0, 1), 6:
> (1, 2), 7: (1, 1), 8: (2, 2), 9: (2, 1), 10: (3, 7), 11: (3, 4), 12:
> (4, 6), 13: (4, 10), 14: (6, 10), 15: (9, 10), 16: (8, 9), 17: (10,
> 9), 18: (5, 8), 19: (6, 7), 20: (3, 1), 21: (4, 2), 22: (4, 1), 23:
> (5, 2), 24: (5, 3), 25: (6, 3), 26: (7, 2), 27: (8, 3), 28: (9, 2),
> 29: (10, 1), 30: (8, 1), 31: (7, 0), 32: (6, 0), 33: (10, 4), 34: (10,
> 5), 35: (11, 5), 36: (11, 4), 37: (11, 2), 38: (11, 10)}
>
>
> If I add a node list, the graph is actually drawn, but I still have an
> error returned:
>
>>>> networkx.draw(G,pos, nodelist=
>>>> [0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,2
>>>> 5,26,27,28,29,30,32,32,33,34,35,36,37,38])
> Traceback (most recent call last):
> File "<stdin>", line 1, in <module>
> File "/Library/Frameworks/Python.framework/Versions/2.5/lib/
> python2.5/site-packages/networkx-1.0.1-py2.5.egg/networkx/drawing/
> nx_pylab.py", line 126, in draw
> File "/Library/Frameworks/Python.framework/Versions/2.5/lib/
> python2.5/site-packages/networkx-1.0.1-py2.5.egg/networkx/drawing/
> nx_pylab.py", line 170, in draw_networkx
> File "/Library/Frameworks/Python.framework/Versions/2.5/lib/
> python2.5/site-packages/networkx-1.0.1-py2.5.egg/networkx/drawing/
> nx_pylab.py", line 302, in draw_networkx_edges
> KeyError: 'n12'
>
>
> Any thoughts?
>
> Thanks,
> Dow
>
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Dow Street
was that it was tripping on n12, vice say n0, which made me think
nodes 0-11 were processing fine. Of course, printing the nodes:
>>> print G.nodes()
['n12', 'n13', 'n10', 'n11', 'n16', 'n17', 'n14', 'n15', 'n18', 'n19',
'n38', 'n39', 'n30', 'n31', 'n32', 'n33', 'n34', 'n35', 'n36', 'n37',
'n29', 'n28', 'n23', 'n22', 'n21', 'n20', 'n27', 'n26', 'n25', 'n24',
'n8', 'n9', 'n0', 'n1', 'n2', 'n3', 'n4', 'n5', 'n6', 'n7']
n12 is first!
Anyway, thanks again.
R,
Dow
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