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Re: [igraph] edge indexing
From: |
Gábor Csárdi |
Subject: |
Re: [igraph] edge indexing |
Date: |
Mon, 15 Jun 2015 11:20:49 -0400 |
On Mon, Jun 15, 2015 at 10:47 AM, Elena Tea Russo
<address@hidden> wrote:
>
> Thank you too, Gabor.
>
> I can just guess the problems that a "fixed" indexing in a graph could lead
> to.
> I suppose neither edges and vertex selectors are then reliable after I modify
> my graph?
Exactly. These are tied to a given graph, and the "modified" graph is
a different graph. In fact the next version of igraph will give an
error if you want to use a vertex/edge sequence with another graph.
Gabor
> I'll have to rethink a bit my code, but I luckily can manage my problem
> throughout an adjacency matrix.
>
> Thanks again!
>
> Et Russo
>
> Il giorno 15/giu/2015, alle ore 15:20, Gábor Csárdi <address@hidden> ha
> scritto:
>
>> Hi,
>>
>> I understand that reassigning ids is very difficult to work with, it
>> was a decision long time ago, and unfortunately we have to live with
>> it now, and for the foreseeable future.
>>
>> A useful way of thinking about this, especially in R, is that igraph
>> _never_ modifies a graph. It always creates new graphs. So when you
>> say delete.edges(), the old graph is not modified, and a new graph is
>> created based on it.
>>
>> In general, you cannot assume anything about the relationship between
>> the internal ids of the old graph and the new graph.
>>
>> I hope this helps,
>> Gabor
>
>
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- Re: [igraph] Import error in python : undefined symbol gzopen64, Tamás Nepusz, 2015/06/10
- Re: [igraph] Import error in python : undefined symbol gzopen64, ashutosh srivastava, 2015/06/10
- Re: [igraph] Import error in python : undefined symbol gzopen64, Tamas Nepusz, 2015/06/11
- Re: [igraph] Import error in python : undefined symbol gzopen64, ashutosh srivastava, 2015/06/12
- [igraph] edge indexing, Elena Tea Russo, 2015/06/14
- Re: [igraph] edge indexing, Tamas Nepusz, 2015/06/15
- Re: [igraph] edge indexing, Elena Tea Russo, 2015/06/15
- Re: [igraph] edge indexing, Gábor Csárdi, 2015/06/15
- Re: [igraph] edge indexing, Elena Tea Russo, 2015/06/15
- Re: [igraph] edge indexing,
Gábor Csárdi <=
- Re: [igraph] Import error in python : undefined symbol gzopen64, Tamas Nepusz, 2015/06/15
- Re: [igraph] Import error in python : undefined symbol gzopen64, Tamas Nepusz, 2015/06/15
- Re: [igraph] Import error in python : undefined symbol gzopen64, ashutosh srivastava, 2015/06/15