Hi Guys!

This is probably a basic question, but I don’t find the clear criteria or 
reference, why in igraph help, you mention that unconnected subgraphs (of x 
isomorphic class) are not considered motifs? For that reason, motifs() is NA 
for unconnected subgraphs. It is also not clear if you mean strongly or weakly 
connected subgraphs

According to Milo et al. (2002) and Shen-Orr et al. (2002) motifs are not 
necessarily connected, even in directed graphs. 

Thank you for your opinions

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