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## Re: [igraph] how to add disconnected nodes to a graph?

**From**: |
Tamás Nepusz |

**Subject**: |
Re: [igraph] how to add disconnected nodes to a graph? |

**Date**: |
Fri, 6 Dec 2013 22:46:13 +0100 |

>* If I am computing the betweenness of a vertex that doesn't connect to any *
>* other node. Shouldn't the betweenness be 0?*
Yes, it should. It seems to be the case in a small example that I constructed
now in IPython:
In [1]: g=Graph.Formula("A--B--C--D--A, E, F")
In [2]: g.betweenness()
Out[2]: [0.5, 0.5, 0.5, 0.5, 0.0, 0.0]
So if you are getting non-zero values for isolated nodes then this does not
seem right.
T.

**[igraph] how to add disconnected nodes to a graph?**, *Ahmed Abdeen Hamed*, `2013/12/06`
**Re: [igraph] how to add disconnected nodes to a graph?**, *Tamás Nepusz*, `2013/12/06`
**Re: [igraph] how to add disconnected nodes to a graph?**, *Ahmed Abdeen Hamed*, `2013/12/06`
**Re: [igraph] how to add disconnected nodes to a graph?**, *Tamás Nepusz*, `2013/12/06`
**Re: [igraph] how to add disconnected nodes to a graph?**, *Ahmed Abdeen Hamed*, `2013/12/06`
**Re: [igraph] how to add disconnected nodes to a graph?**,
*Tamás Nepusz* **<=**
**Re: [igraph] how to add disconnected nodes to a graph?**, *Ahmed Gmail*, `2013/12/06`
**Re: [igraph] how to add disconnected nodes to a graph?**, *Tamás Nepusz*, `2013/12/06`
**Re: [igraph] how to add disconnected nodes to a graph?**, *Ahmed Abdeen Hamed*, `2013/12/07`