如何为 sankeyNetwork() 定义节点和链接数据框

Question

我有一个从源国家出口到目标国家的文件，贸易价值在 Before_value 维度。我的数据在 data.table 中，尺寸为 source 和 target 作为字符（国家代码列表）和 beofre_value 数字。

我想使用 networkd3 中的 sankeyNetwork() 生成一个桑基图，左边是源国家，右边是目标国家，并表示流量。如何正确定义节点和链接数据框？我有这些行：

library("networkD3")

sankeyNetwork(Links = IMP$source, Nodes = iMP$target, Source = "source",
              Target = "target", Value = "Before_value", fontSize = 25, 
              nodeWidth = 30, fontFamily = "sans-serif", iterations = 0)

我收到了他的错误信息：Error in Links[, Source] : incorrect number of dimensions

Answer 1

我相信您是在谈论 networkD3 中的 sankeyNetwork() 函数，而不是 plotly 包。假设是这种情况，这里有一个最小的可重现示例来演示您的特定用例。

library(networkD3)

IMP <- data.frame(source = c("DEU", "DEU", "DEU", "FRA", "FRA", "FRA"),
                  target = c("ESP", "GBR", "ITA", "ESP", "GBR", "ITA"),
                  Before_value = c(4,2,7,4,1,8))

# create nodes data by determining all unique nodes found in your data
node_names <- unique(c(as.character(IMP$source), as.character(IMP$target)))
nodes <- data.frame(name = node_names)

# create links data by matching the source and target values to the index of the
# node it refers to in the nodes data frame
links <- data.frame(source = match(IMP$source, node_names) - 1,
                    target = match(IMP$target, node_names) - 1,
                    Before_value = IMP$Before_value)

sankeyNetwork(Links = links, Nodes = nodes, Source = "source", 
              Target = "target", Value = "Before_value")

如何为 sankeyNetwork() 定义节点和链接数据框

how to define nodes and links data frame for sankeyNetwork()

r

sankey-diagram

networkd3

htmlwidgets