
From:  Tamas Nepusz 
Subject:  Re: [igraph] Question about igraph and graph.data.frame in R 
Date:  Fri, 13 Jun 2008 11:35:22 +0200 
Hi Peter,
My data frame (named forclus) has 796 rows (people) and 524 columns (variables).I can create a distance matrix using the dist function: dist < as.matrix(dist(forclus)) I can create names for the rows using row.names(forclus).But in your documentation you list a rather small data frame, with three nodes (foo,bar, and foobar), 2 edges, and the weights entered by hand.
Do you have any suggestions as to how I can go from my large data frame to a graph,I'm not particularly familiar with the R interface, but maybe graph.adjacency() helps:and then to a minimum spanning tree?
http://cneurocvs.rmki.kfki.hu/igraph/doc/R/graph.adjacency.htmlThis function creates a graph based on a weighted adjacency matrix, which (according to my understanding) is exactly the distance matrix what you have. Vertex names can be assigned later to the graph as a vertex attribute.
Regards,  Tamas
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