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Re: [igraph] add vertex attributes from a data.frame
From: |
Gábor Csárdi |
Subject: |
Re: [igraph] add vertex attributes from a data.frame |
Date: |
Thu, 24 Mar 2011 16:27:47 -0400 |
Hi Simone,
On Thu, Mar 24, 2011 at 3:50 PM, Simone Gabbriellini <address@hidden> wrote:
> Hello List,
>
> i am trying to add a vertex attribute from a data.frame like:
>
>>
> who_invited_whom
>
> invited inviter
> 1 user139 user83
> 2 user140 user83
> 3 user141 user83
> 4 user142 user83
> 5 user143 user83
> 6 user144 user83
>
> I would like to add an attribute "invitedby" to vertex of type==0. I am
> trying this:
>
> V(g)[type==0 & name %in%
> who_invited_whom$invited]$invitedby<-who_invited_whom$inviter
You get the warning because the number of vertices you select on the
left hand side does not match the length of the right hand side.
But anyway, I think this is wrong, because nothing ensures that the
order of the vertices is the same on the left and right hand side. I
think you want something like
V(g)$invitedby <- as.character(NA)
ord <- match(who_invited_whom$invited, V(g)$name[V(g)$type==0])
V(g)$invitedby[V(g)$type==0][ord] <- as.character(who_invited_whom$inviter)
I haven't tested it much, it seems to work for the toy data I just made up.
Best,
Gabor
> Warning message:
> In graph[[9]][[3]][[name]][index] <- value :
> il numero di elementi da sostituire non `e un multiplo della lunghezza di
> sostituzione
>
> Why am I getting the warning? Am I doing something wrong here?
>
> thanks for your help!
>
> best regards,
> Simone
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>
--
Gabor Csardi <address@hidden> MTA KFKI RMKI