使用riverplot畫桑基圖

#生成桑基圖的邊，N1存儲源節點，N2存儲目的節點，Value存儲邊的值 edges = data.frame(N1 = c("Direct","SEM","引薦","自然搜索","行業","提交量"),                     N2 = c(rep("行業",each=4),"提交量","託管量"),                      Value = c(28,32,18

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