Re: [igraph] Need your help

[Gábor Csárdi]

Hi Vincent,

perhaps read http://igraph.sourceforge.net/igraphbook/igraphbook-creating.html
after reading an R tutorial. See the R homepage for tutorials.

Gabor

On Tue, Apr 20, 2010 at 9:43 PM, Vincent Gagnon <address@hidden> wrote:
> Hi Gabor,
>
> I now understand what you meant by R and Python, those are two languages of
> programmation for SNA. Is that correct? I know I'm a newbie in SNA. I have
> looked at your attached links and I've seen that among all possible SNA
> representation, the way to generate coordinate are the followings:
>
> layout.random(graph, params, dim=2)
> layout.circle(graph, params)
> layout.sphere(graph, params)
> layout.fruchterman.reingold(graph, ..., dim=2,
>       verbose=igraph.par("verbose"), params)
> layout.kamada.kawai(graph, ..., dim=2,
>
>       verbose=igraph.par("verbose"), params)
> layout.spring(graph, ..., params)
> layout.reingold.tilford(graph, ..., params)
> layout.fruchterman.reingold.grid(graph, ...,
>       verbose=igraph.par("verbose"), params)
>
> layout.lgl(graph, ..., params)
> layout.graphopt(graph, ..., verbose = igraph.par("verbose"), params =
> list())
> layout.mds(graph, d=shortest.paths(graph), ...)
> layout.svd(graph, d=shortest.paths(graph), ...)
>
> layout.norm(layout, xmin = NULL, xmax = NULL, ymin = NULL, ymax = NULL,
>       zmin = NULL, zmax = NULL)
>
> We are looking for a way to calculate the data positionning. We don't know
> how to proceed with calculation, but from your database information, I think
> it will be something like "layout.fruchterman.reingold" or another function.
>
> For you information, I've attached a picture of our actual SNA displays. We
> can generate circle representations and some random placing nodes. We would
> like to succeed in placing them in a Fruchterman Reingold display.
>
> Can you help us programming the algorithm? Or, how do we calculte nodes
> positionning?
>
> Thank you for your help,
>
> Vincent Gagnon
> University of Quebec in Chicoutimi
> Canada
>
>
> 2010/4/20 Gábor Csárdi <address@hidden>
>>
>> Hi Vincent,
>>
>> next time, please reply to the mailing list as well. Thanks.
>>
>> You have a long way to go to work with igraph if you do not know R or
>> Python. Here is where to start:
>>
>> http://www.r-project.org
>> http://www.python.org
>>
>> Gabor
>>
>> On Tue, Apr 20, 2010 at 9:04 PM, Vincent Gagnon <address@hidden>
>> wrote:
>> > Hi Gabor,
>> >
>> > 2010/4/20 Gábor Csárdi <address@hidden>
>> >>
>> >> Hi Vicent,
>> >>
>> >> On Tue, Apr 20, 2010 at 8:44 PM, Vincent Gagnon
>> >> <address@hidden>
>> >> wrote:
>> >> > Hello igraph-help members,
>> >> >
>> >> > I am an assistant on a research project in Canada. We are trying to
>> >> > solve an
>> >> > issue with social network analysis. Our main concern is how to
>> >> > proceed
>> >> > to
>> >> > place dots in the matrix?
>> >>
>> >> what exactly do you mean by this?
>> >>
>> >> You need a way to smartly place the
>> >> nodes for drawing the graph?
>> >
>> > Yes, I need to understand how to have a smart way to place nodes in the
>> > graph.
>> >>
>> >> You did not tell us whether you want to
>> >
>> > I don't know the difference between R and Pythin. Can you show me or
>> > explain
>> > me?
>> >>
>> >> use R or Python. In R this would be something like:
>> >>
>> >> pos <- layout.fruchterman.reingold(mygraph)
>> >> plot(mygraph, layout=pos)
>> >>
>> >> Check the documentation for the various plot options at
>> >> http://igraph.sourceforge.net/doc/R/layout.html or type
>> >>
>> >> help("layout.kamada.kawai")
>> >>
>> >> in your R session. See also the plotting parameters at
>> >> http://igraph.sourceforge.net/doc/R/plot.common.html or type
>> >>
>> >> help("igraph.plotting")
>> >>
>> >> Gabor
>> >
>> > Thank you Gabor!
>> >>
>> >> > How can we place all dots on our social network
>> >> > graph? If you can answer me in terms of programming, it would really
>> >> > help
>> >> > us. Presently, we only manage to place them in circle but we know
>> >> > it's
>> >> > not
>> >> > the best way to represent our social network.
>> >> >
>> >> > Thank you very much,
>> >> >
>> >> > Vincent Gagnon
>> >> > University of Quebec in Chicoutimi
>> >> > Canada
>> >> >
>> >> > http://igraph.sourceforge.net/screenshots.html
>> >> >
>> >> > _______________________________________________
>> >> > igraph-help mailing list
>> >> > address@hidden
>> >> > http://lists.nongnu.org/mailman/listinfo/igraph-help
>> >> >
>> >> >
>> >>
>> >>
>> >>
>> >> --
>> >> Gabor Csardi <address@hidden>     UNIL DGM
>> >
>> >
>>
>>
>>
>> --
>> Gabor Csardi <address@hidden>     UNIL DGM
>
>



-- 
Gabor Csardi <address@hidden>     UNIL DGM