RuntimeWarning: invalid value encountered in true_divide

[afandiadib]

Hi,

I just installed forgi via pip and I got this error when I want to visualize RNA structure. It happened on some of my RNA structures.

/mnt/Data/Programs/conda/lib/python3.8/site-packages/forgi/visual/mplotlib.py:118: RuntimeWarning: invalid value encountered in true_divide
norm_vec/=ftuv.magnitude(norm_vec)

Code to reproduce:

import forgi.graph.bulge_graph as fgb
import forgi.visual.mplotlib as fvm

bg = fgb.BulgeGraph.from_dotbracket('......((((((((((((((((......))))))))))))))))((((.(((((....).))))))))(((((((....))))))).....................')
fvm.plot_rna(bg)

[mwittep]

Similar error here. I have tried 3 python versions (3.6, 3.8 and 3.9). For the following sequences I get the same error as above:

bg = fgb.BulgeGraph.from_dotbracket("((...)).(..(..))")
bg = fgb.BulgeGraph.from_dotbracket("((...)).(.(..))")

But the following one does work:

bg = fgb.BulgeGraph.from_dotbracket("((...)).((..))")