> > Maybe you want this: > http://en.wikipedia.org/wiki/Euclidean_minimum_spanning_tree > Do you? >
Yes, this is correct. > > What is the rule to connect the > dots? > In the link you gave me, I see the following sentence : << [...] an EMST (Euclidean minimum spanning tree) connects a set of dots using lines such that the total length of all the lines is minimised and any dot can be reached from any other by following the lines. >> Isn't that the rule? i.e. that my objects in the RA vs DEC place are connected such that the total length of all the lines is minimised? I can add that all my objects have the same weight. > > On Wed, Mar 5, 2014 at 11:17 AM, Steve Boudreault > <[email protected] >> wrote: >> > But I'd prefer you tell us want you want to do, and then we don't need >> > to >> > guess. >> Please look at the following image : >> http://inspirehep.net/record/833443/files/mst.png >> These are "minimum spanning tree" (right?) of stars distributed in X (i.e. >> right ascension, RA) and Y (i.e. declination, DEC). You have this for three open clusters : IC2391, M34, M11. > Again. The minimum spanning trees in igraph are defined for graphs (=networks), not for points: > http://en.wikipedia.org/wiki/Minimum_spanning_tree > Maybe you want this: > http://en.wikipedia.org/wiki/Euclidean_minimum_spanning_tree > Do you? > This *is* what I want to do. I want to do a plot like this. > This is not an explanation, I am sorry. What is the rule to connect the dots? Maybe this is evident for people in your field, but not to me. G. > [...] -- ============================================================ Steve Boudreault, Ph.D. CNRS UMR 8111 / GÉPI Bâtiment 11 - Hipparque Email: [email protected] Observatoire de Paris Phone : +33 (0) 145077868 5 Place Jules Janssen Fax: +33 (0) 145077878 92190 Meudon, France Mobile : +33 (0) 604530082 ============================================================ _______________________________________________ igraph-help mailing list [email protected] https://lists.nongnu.org/mailman/listinfo/igraph-help
