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## [igraph] Question about igraph and graph.data.frame in R

**From**: |
Peter Flom |

**Subject**: |
[igraph] Question about igraph and graph.data.frame in R |

**Date**: |
Wed, 11 Jun 2008 09:49:47 -0400 (GMT-04:00) |

Hello
I just got the igraph package in R, it looks great. I have a very basic
question:
I would like to create a minimum spanning tree of a large data set. I am having
some trouble creating the graph on which minimum.spanning.tree could work.
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,
and then to a minimum spanning tree?
Thanks in advance
Peter
Peter L. Flom, PhD
Statistical Consultant
www DOT peterflom DOT com

**[igraph] Question about igraph and graph.data.frame in R**,
*Peter Flom* **<=**