Indicate specific colors for every link within a force-directed network using networkD3::forceNetwork()

How can we assign different colors to links based on their weight using the networkD3::forceNetwork function in R? For example, using the color Blue for links with a weight greater than 1 and dark for links with a weight less than 1.

Here is an example code snippet from the networkD3 website (specifically the forceNetwork section):

library(networkD3)
# Load data
data(MisLinks)
data(MisNodes)

# Plot
forceNetwork(Links = MisLinks, Nodes = MisNodes,
        Source = "source", Target = "target",
        Value = "value", NodeID = "name",
        Group = "group", opacity = 0.8)

I came across a d3-js related question here (I currently have no knowledge of JavaScript).

javascriptrshinynetworkd3

Answer №1

My suggestion is to pass a JavaScript function enclosed in JS to the linkColour parameter in order to generate colors based on the values in MisLinks. For instance, returning blue links when values are greater than 1 and red for values less than or equal to 1.

forceNetwork(Links = MisLinks, Nodes = MisNodes,
             Source = "source", Target = "target",
             Value = "value", NodeID = "name",
             Group = "group", opacity = 0.8,
             linkColour = JS('function(l) { return l.value > 1 ? "#00F" : "#F00" }'))

Answer №2

Dealing with a similar issue while working on networkD3 recently has led me to the following solution:
To achieve this, you can utilize a vector that is based on the values of MisLinks$value with the ifelse function:

forceNetwork(Links = MisLinks, Nodes = MisNodes,
         Source = "source", Target = "target",
         Value = "value", NodeID = "name",
         Group = "group", opacity = 0.8,
         linkColour = ifelse(MisLinks$value > 1, "blue","black"))

This method does not require any knowledge of javascript.
I hope this explanation proves useful.

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