Re: [igraph] igraph-help Digest, Vol 82, Issue 8

[ash nix]

Thanks for the update.

 I found the wrong info here  http://igraph.wikidot.com/r-traps 

On Thu, May 9, 2013 at 12:00 PM, <address@hidden> wrote:

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Today's Topics:

   1. igraph vertex index (ash nix)
   2. Re: igraph vertex index (G?bor Cs?rdi)
   3. Re: igraph vertex index (Szabolcs Horv?t)


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Message: 1
Date: Thu, 9 May 2013 11:41:02 -0400
From: ash nix <address@hidden>
To: address@hidden
Subject: [igraph] igraph vertex index
Message-ID:
        <address@hidden>
Content-Type: text/plain; charset="iso-8859-1"

Hi,

I am new to igraph and confused about the starting index for vertex.
Many documentation says that starting index for vertex in R is 0.
But on R I get the starting index as 1.

Please following

> V(kap)[0]
Vertex sequence:
character(0)
> V(kap)[1]
Vertex sequence:
[1] "moskowitz"

--
Thanks,
A
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Message: 2
Date: Thu, 9 May 2013 11:43:31 -0400
From: G?bor Cs?rdi <address@hidden>
To: Help for igraph users <address@hidden>
Subject: Re: [igraph] igraph vertex index
Message-ID:
        <CABtg=K=9x8g-TMJ0kC9FmfZDTsfscOw=tH=address@hidden>
Content-Type: text/plain; charset="iso-8859-1"

On Thu, May 9, 2013 at 11:41 AM, ash nix <address@hidden> wrote:

> Hi,
>
> I am new to igraph and confused about the starting index for vertex.
> Many documentation says that starting index for vertex in R is 0.
>

Where? These are outdated or wrong. See e.g. ?igraph.

Gabor


> But on R I get the starting index as 1.
>

> Please following
>
> > V(kap)[0]
> Vertex sequence:
> character(0)
> > V(kap)[1]
> Vertex sequence:
> [1] "moskowitz"
>
> --
> Thanks,
> A
>
> _______________________________________________
> igraph-help mailing list
> address@hidden
> https://lists.nongnu.org/mailman/listinfo/igraph-help
>
>


--
Gabor Csardi <address@hidden>     MTA KFKI RMKI
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Message: 3
Date: Thu, 9 May 2013 11:44:10 -0400
From: Szabolcs Horv?t <address@hidden>
To: Help for igraph users <address@hidden>
Subject: Re: [igraph] igraph vertex index
Message-ID:
        <CAJDnrnq4cWcj_Bbd8t_=address@hidden>
Content-Type: text/plain; charset="utf-8"

Hi,

The starting index in R should be 1, not 0.  This corresponds to R's
1-based array indexing.

There are some functions which will sometimes (incorrectly) return 0-based
indices, see e.g. here:

http://lists.nongnu.org/archive/html/igraph-help/2013-05/msg00002.html




On 9 May 2013 11:41, ash nix <address@hidden> wrote:

> Hi,
>
> I am new to igraph and confused about the starting index for vertex.
> Many documentation says that starting index for vertex in R is 0.
> But on R I get the starting index as 1.
>
> Please following
>
> > V(kap)[0]
> Vertex sequence:
> character(0)
> > V(kap)[1]
> Vertex sequence:
> [1] "moskowitz"
>
> --
> Thanks,
> A
>
> _______________________________________________
> igraph-help mailing list
> address@hidden
> https://lists.nongnu.org/mailman/listinfo/igraph-help
>
>
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End of igraph-help Digest, Vol 82, Issue 8
******************************************

--
Thanks,
A