Any way to build a graph ( igraph package ) from a Data Frame in R ?
The data frame contains node relationships.
df = data.frame (
A = c("Berlin", "Amsterdam", "New York") ,
B = c("Munich", "Utrecht", "Chicago")
)
Edges are :
Berlin -> Munich
Amsteram -> Utrecht
New York -> Chicago
igraph is very flexible and I'm sure there are a number ways to accomplish this. I found the tutorials provided on the website to be very helpful.
Here's one simple way to create a network plot from a data.frame:
library(igraph)
df <- data.frame(
A = c("Berlin", "Amsterdam", "New York") ,
B = c("Munich", "Utrecht", "Chicago"))
df.g <- graph.data.frame(d = df, directed = FALSE)
plot(df.g, vertex.label = V(df.g)$name)
Note: For current versions of igraph
(as of Version 1.2.1), the graph.data.frame()
function is changed to graph_from_data_frame()
, which is the only function out of these two to appear in the documentation . The graph.data.frame()
function will still work, though.
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