R Highcharter Sankey节点列属性问题

Posted 2021-05-05

我想使用highcharter包在R中绘制一个Sankey图。我在格式化时面临问题。这是一个例子。

# devtools::install_github("jbkunst/highcharter")
library(highcharter)

hc_dat <- data.frame(from = c("A", "A", "B"), 
                     to = c("C", "B", "C"), N = c(7, 5, 5))
highchart() %>%
  hc_add_series(data = hc_dat, type = "sankey", 
                hcaes(from = from, to = to, weight = N))

这产生了以下图片：

我希望B节点处于中间位置，以便更好地了解情节。所以我试图在Highcharts系列中实现这个操纵column的nodes属性：

nodes_mapping <- list(list(id = "A", column = 0),
                      list(id = "B", column = 1),
                      list(id = "C", column = 2))

highchart() %>%
  hc_add_series(data = hc_dat, type = "sankey", 
                nodes = nodes_mapping,
                hcaes(from = from, to = to, weight = N))

这不会改变图片。我发现，原因如下：highcharter使用jsonlite::toJSON转换R对象，它在JSON中提供了不必要的[]，这破坏了Highcharts的行为。

jsonlite::toJSON(nodes_mapping)
# [{"id":["A"],"column":[0]},{"id":["B"],"column":[1]},{"id":["C"],"column":[2]}]

相同但使用"A"而不是["A"]等将起作用。 JS中的证据就在这个jsfiddle中。

我试图用htmlwidgets::JS在javascript中嵌入JavaScript，但它不起作用：

highchart() %>%
  hc_add_series(data = hc_dat, type = "sankey", 
                nodes = JS('[{"id":"A","column":[0]},{"id":"B","column":[1]},{"id":"C","column":[2]}]'),
                hcaes(from = from, to = to, weight = N))
# empty chart

highchart() %>%
  hc_add_series(data = hc_dat, type = "sankey", 
                JS('nodes: [{"id":"A","column":[0]},{"id":"B","column":[1]},{"id":"C","column":[2]}]'),
                hcaes(from = from, to = to, weight = N))
# Error: inherits(mapping, "hcaes") is not TRUE

highchart() %>%
  hc_add_series(data = hc_dat, type = "sankey", 
                hcaes(from = from, to = to, weight = N),
                JS('nodes: [{"id":"A","column":[0]},{"id":"B","column":[1]},{"id":"C","column":[2]}]'))
# Error: Column 4 must be named

所以，我在这里被困住了。有谁知道如何让hc_add_series考虑系列的属性，因为在这种情况下需要它？

答案

来自A-> B和B-> C的Sankey可以通过重新定义基础数据来完成：

 hc_dat <- data.frame(from = c("A", "B"), 
                 to = c("B", "C"), N = c(7, 5))

同样，您可以从A-> C定义节点

 hc_dat <- data.frame(from = c("A", "B", "A"), 
                 to = c("B", "C", "C"), N = c(5, 5, 7))

但是，这并不能提供一个很好的情节。

另一答案

正如评论中已经提到的，你可能想给networkD3一个镜头。

以下是基于您提供的示例数据的示例。

# Create nodes and links data.frames
nodes <- data.frame(name = unique(unlist(hc_dat[, 1:2])))
links <- data.frame(
    source = match(hc_dat$from, nodes$name) - 1,
    target = match(hc_dat$to, nodes$name) - 1,
    value = hc_dat$N)

# Draw a Sankey diagram
library(networkD3)
sankeyNetwork(
    Links = links, Nodes = nodes,
    Source = "source", Target = "target", Value = "value", NodeID = "name",
    fontSize = 16, fontFamily = "sans-serif", nodeWidth = 30, nodePadding = 30)