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fix the division by 0 with single node #4

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fix the division by 0 with single node #4

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10 changes: 8 additions & 2 deletions pylouvain.py
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Original file line number Diff line number Diff line change
Expand Up @@ -140,7 +140,10 @@ def compute_modularity(self, partition):
q = 0
m2 = self.m * 2
for i in range(len(partition)):
q += self.s_in[i] / m2 - (self.s_tot[i] / m2) ** 2
try:
q += self.s_in[i] / m2 - (self.s_tot[i] / m2) ** 2
except:
q += 0
return q

'''
Expand All @@ -150,7 +153,10 @@ def compute_modularity(self, partition):
_k_i_in: the sum of the weights of the links from _node to nodes in _c
'''
def compute_modularity_gain(self, node, c, k_i_in):
return 2 * k_i_in - self.s_tot[c] * self.k_i[node] / self.m
try:
return 2 * k_i_in - self.s_tot[c] * self.k_i[node] / self.m
except:
return 0

'''
Performs the first phase of the method.
Expand Down