Re: [igraph] delete connected vertices of to-be-deleted vertices

[Cesar Caballero]

Thanks very much.
Cesar

----------------------------------------------------------------------
Cesar Caballero
MRI engineer
www.bcbl.eu 

Twitter: @caballerogaudes
www.researchgate.net/profile/Cesar_Caballero2

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----- Original Message -----
From: "Tamas Nepusz" <address@hidden>
To: "igraph-help" <address@hidden>
Sent: Thursday, October 29, 2015 10:47:38 PM
Subject: Re: [igraph] delete connected vertices of to-be-deleted vertices

Hi Cesar,

> But, does this step ALSO remove THEIR CONNECTED VERTICES?
No - quite unsurprisingly, delete.vertices() will delete only those
vertices that you specify explicitly.

> If not, how can I achieve this?
Use the ego() function to extract the list of vertices that are at
most a given number of steps to a given seed vertex, followed by
unlist() and unique():

vs <- c(1,2,3,4)
unique(unlist(ego(g, 1, vs)))

This gives you a numeric vector that contains the seed vertices (in
vs) and all the vertices that are neighbors of at least one seed
vertex.

T.

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