I would like to draw standard G=(V,E) graph in R either by ggplot or some R built-in functions.
I have a data frame containing vertices coords:
> V
x y
1 589.3438 6422.883
2 8762.6921 7789.147
3 7973.0883 4552.745
4 4100.8408 8108.702
5 6049.3329 6547.239
> E
[,1] [,2] [,3] [,4] [,5]
[1,] 0 0 0 1 0
[2,] 0 0 1 0 1
[3,] 0 1 0 0 1
[4,] 1 0 0 0 1
[5,] 0 1 1 1 0
plotGraph <- function() {
qplot(x,
y,
data=V,
xlim=c(0,SIZE),
ylim=c(0,SIZE),
main="Graph"
)
}
If using igraph
is an option, I would recommend it. It's a very useful package when working with graphs. Here's how I would do it using igraph:
library(igraph)
# convert V and E to matrices
V <- data.matrix(V)
g <- graph_from_adjacency_matrix(E, mode="undirected")
plot.igraph(g, layout = V)
Alternatively, if you want a ggplot-flavored method, you can use ggnet2
from the GGally
package:
library(GGally)
V <- data.matrix(V)
# with ggnet2 you don't have to convert E to a graph
ggnet2(net = E, mode = V )