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I am using networkD3 to create sankey diagrams in R. I am using something like below to generate the diagrams:

sankeyNetwork(Links = data$links, Nodes = data$nodes, 
          Source = "source", Target = "target", Value = "value", NodeID = "name",
          units = "Questions", fontSize = 12, nodeWidth = 10, 
          colourScale = "d3.scale.category10()",
          LinkGroup = "type",             #<--assign colors to links
          width = 1000, height = 600)

I am using LinkGroup = "type" to color the links, where the type is basically the source node's name. This makes the link color same as source node color. This is working pretty well.

I was wondering if there is anyway a gradient of color can be created from sources to targets for the associated links?

Sayan Pal
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