使用riverplot画桑基图

#生成桑基图的边，N1存储源节点，N2存储目的节点，Value存储边的值 edges = data.frame(N1 = c("Direct","SEM","引荐","自然搜索","行业","提交量"),                     N2 = c(rep("行业",each=4),"提交量","托管量"),                      Value = c(28,32,18

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