[R] How are tables accessed?

lpupp lucagaegauf at gmx.ch
Tue Sep 10 02:11:33 CEST 2013


Hey everyone,

I have a small problem understanding how matrices are accessed.

I created 2 matrices: 

data <- structure(c("A", "B", "C", "D", "D", "E", "H", "H", "H", "I", 
                    "F", "G", "F", "F", "G", "G", "F", "G", "I", "J"), 
                  .Dim = c(10L, 2L), .Dimnames = list(NULL, c("source",
"target")))

layout <- structure(c(-3.26366930571836, -5.50712710968822,
-0.551118328281495, -3.37122322327009, -5.66968864118556, -2.33181335195352,
-0.48117505795906, -7.44294029152183, -9.97273217503719, -8.78752994522558,
-8.32625987988611, -5.19337297863283, -1.01252729738437, -2.2253279705488,
-8.08918461763048, -5.09532606864114, -3.15827376499008, -1.940378485401,,
0.600378834777586, 3.57175093511171), 
                    .Dim = c(10L, 2L), .Dimnames = list(NULL,
c("coordinate.1", "coordinate.2")))

my problem occurs when I try to plot a network:

base.net <- graph.edgelist(data, directed=FALSE)
plot(base.net, layout=layout)

The network needs to be structured in a very specific way and I don't
understand in which order the coordinates I created are assigned to the
nodes. (All nodes are labeled A-J. The coordinates aren't assigned
alphabetically or in the order of occurrence in the data matrix).

I hope someone can help me out. Thanks in advance!

L





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