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From: | Gábor Csárdi |
Subject: | Re: [igraph] how to plot a very basic MST with igraph |
Date: | Wed, 5 Mar 2014 10:11:25 -0500 |
Greetings,
I am new to R, and probably this is a very simple problem with very few
things to do. (Sorry if this is the case.)
Here I go ...
I have a list of about 1000 objects in the file "list.csv". It looks like
this :
alpa delta
0.923 -12.345
0.912 -11.222
0.812 -11.763
0.902 -11.923
0.942 -12.001
... ...
Alpha is the X axis and delta is the Y axis.
I would like to produce a very simple minimum spanning tree plot, like the
ones I attached with this message.
The informations I got so far using igraph in R implied using an adjacent
matrix (e.g. "G <- graph.adjacency(as.matrix(D), weighted=TRUE)"). Maybe I
miss something important ...
but I fail to understand why I should need a
n x n matrix to make an MST for my list of [X,Y] objects.
Can someone tell me how I can produce a simple minimum spanning tree plot?
Thank you very much for your help.
Best regards,
Steve Boudreault
--
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Steve Boudreault, Ph.D.
CNRS UMR 8111 / GÉPI
Bâtiment 11 - Hipparque Email: address@hidden
Observatoire de Paris Phone : +33 (0) 145077868
5 Place Jules Janssen Fax: +33 (0) 145077878
92190 Meudon, France Mobile : +33 (0) 604530082
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