Re: [igraph] simplify and edge.attr.comb

[Gábor Csárdi]

YEs, but what is wrong with "weight=function (x) unique (x)" or
"weight='first'" ?

G.

On Sun, Nov 24, 2013 at 12:28 PM, Hermann Norpois <address@hidden> wrote:
> Yes, the weights (between multiple vertices) are the same. The vertices are
> snps and the weights LDs.
> Thanks.
>
>
>
> 2013/11/24 Gábor Csárdi <address@hidden>
>>
>> On Sun, Nov 24, 2013 at 11:57 AM, Hermann Norpois <address@hidden>
>> wrote:
>> > Hello,
>> > I have an undirected graph g and I used
>> >
>> > g <- simplify (g)
>> >
>> > to remove multiple edges. The problem is that I dont find the correct
>> > syntax for edge.attr.comp. I want my weights (for E(g)$weight) not being
>> > altered. The weights should not be touched at all. I just want multiple
>> > edges to vanish.
>>
>> You need to do _something_ with the weights, because you are merging
>> multiple edges into a single one, and these edges potentially have
>> different weights. You cannot have them "not to be touched at all".
>>
>> > I tried
>> >  g <- simplify (g, edge.attr.comb=list (weight=function (x) unique (x),
>> > name="ignore"))
>>
>> I see. So you are sure that multiple edges between two vertices always
>> have the same weight? Then this is a good solution.
>>
>> > and it seems to work but I am not happy with it.
>>
>> Why?
>>
>> > Could you please help to ameliorate the expression?
>>
>> You can say weight="first" which is the same, if all the weights are
>> the same, but how much better is that?
>>
>> G.
>>
>> > Thanks
>> > Hermann
>> >
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>> >
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