Using igraph to calculate topological property

Hi everyone,

I have got the Spearman correlation matrix of my sequencing data and I want to visualize it and calculate the topological property of the network.

Here I have one questions: Do I need to delete the isolated nodes (the correlation of the ASV is 0) before using igraph to calculate topological property of the graph? How the results can be different with deleting and without deleting?

Thank you so much for your help!