Re: [igraph] Can't get same results from newer layout.fruchterman.reingold

[HIGUCHI Koichi]

Hi, thank you very much for your reply!

I use "start" option in "layout.fruchterman.reingold()" command in the
test code to avoid random start. So "set.seed()" does not have any
effect on the results, does it?

I guess the algorism has been improved and I need to use old version
to get the same result. Maybe I can run secondary R instance with
older Igraph to do layout, or just move to the improved layout
function.

Thanks again.
Best regards.

2014-02-12 0:39 GMT+09:00 Gábor Csárdi <address@hidden>:
> Hi, you also need to specify the random seed via set.seed.
>
> That said, you still might get different layouts with different igraph
> versions, because we are trying to improve the algorithms. If setting the
> seed does not work, then you can generate the layout in the old version,
> save the coordinates and then use them with the new version.
>
> Unfortunately R does not really support using different versions of the same
> package at the same time.
>
> Best,
> Gabor
>
>
> On Tue, Feb 11, 2014 at 10:35 AM, HIGUCHI Koichi <address@hidden>
> wrote:
>>
>> Does anybody have any ideas?
>>
>> Thanks.
>>
>> 2013-08-29 15:32 GMT+09:00 HIGUCHI Koichi <address@hidden>:
>> > Hello.
>> >
>> > I am using igraph R package and moving from igraph 0.5.5 to 0.6.5.
>> >
>> > But I found that I can't get the same result from
>> > layout.fruchterman.reingold function of 0.6.5 even if I specified the
>> > same network object and the same starting positions. The output
>> > layouts are different between 0.5.5 and 0.6.5.
>> >
>> > Is there any way to reproduce the same result as 0.5.5 using 0.6.5??
>> >
>> > Here is my test code:
>> > http://koichi.nihon.to/psnl/tmp/net_test.r
>> >
>> > igraph 0.5.5 result:
>> > http://koichi.nihon.to/psnl/tmp/055.png
>> >
>> > igraph 0.6.5 result:
>> > http://koichi.nihon.to/psnl/tmp/065.png
>> >
>> > New layout is not bad at all, but I would like to have the same
>> > results when I input the same data.
>> >
>> > Thank you! And sorry for my poor English.
>> >
>> > BTW, I am developing a content analysis (text data mining) software
>> > using the igraph package. Igraph package is really useful and nice
>> > software! Thank you very much for the effort!
>> > http://khc.sourceforge.net/en/gallery/
>> >
>> > Koichi, Higuchi
>>
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