I have used the d3r
package to convert an igraph
object to JSON format like so:
# create small world network
net <- sample_smallworld(size = 8, dim = 1, nei = 1, p = 0.33)
# convert to json with directional edges
data_json <- d3_igraph(as.directed(net))
This gives me the following output:
> data_json
{"nodes":[{"id":"0"},{"id":"1"},{"id":"2"},{"id":"3"},{"id":"4"},{"id":"5"},{"id":"6"},{"id":"7"}],"links":[{"source":"0","target":"1"},{"source":"1","target":"6"},{"source":"2","target":"3"},{"source":"3","target":"4"},{"source":"0","target":"4"},{"source":"3","target":"5"},{"source":"6","target":"7"},{"source":"0","target":"7"},{"source":"1","target":"0"},{"source":"6","target":"1"},{"source":"3","target":"2"},{"source":"4","target":"3"},{"source":"4","target":"0"},{"source":"5","target":"3"},{"source":"7","target":"6"},{"source":"7","target":"0"}],"attributes":{"name":"Watts-Strogatz random graph","dim":1,"size":8,"nei":1,"p":0.33,"loops":false,"multiple":false}}
This is nearly what I want, but I need to configure two things:
{"source": 1, "target": 2}
, instead of {"source": "1", "target": "2"}
I could of course just do this manually for a small network like this, but that's tedious and not scalable for large networks. Is there better way I can this is R
?
It's easy enough to convert the json into an R list and make the necessary changes to the data before writing back to json. Here's a function that should do the trick for the output of d3_igraph
, using tools from the jsonlite
package:
fix_d3_json <- function(json)
{
dj <- jsonlite::fromJSON(data_json)
dj$nodes$id <- as.numeric(dj$nodes$id) + 1
dj$links[[1]] <- as.numeric(dj$links[[1]]) + 1
dj$links[[2]] <- as.numeric(dj$links[[2]]) + 1
jsonlite::toJSON(dj)
}
So now you can do:
library(igraph)
library(d3r)
# create small world network
net <- sample_smallworld(size = 8, dim = 1, nei = 1, p = 0.33)
# convert to json with directional edges
data_json <- d3_igraph(as.directed(net))
# Fix json
data_json <- fix_d3_json(data_json)
data_json
#> {"nodes":[{"id":1},{"id":2},{"id":3},{"id":4},{"id":5},{"id":6},{"id":7},
#> {"id":8}],"links":[{"source":1,"target":6},{"source":1,"target":2},
#> {"source":2,"target":3},{"source":3,"target":4},{"source":2,"target":6},
#> {"source":3,"target":6},{"source":6,"target":7},{"source":1,"target":7},
#> {"source":6,"target":1},{"source":2,"target":1},{"source":3,"target":2},
#> {"source":4,"target":3},{"source":6,"target":2},{"source":6,"target":3},
#> {"source":7,"target":6},{"source":7,"target":1}],"attributes":
#> {"name":["Watts-Strogatz random graph"],"dim":[1],"size":[8],"nei":[1],
#> "p":[0.33],"loops":[false],"multiple":[false]}}
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