来自ggfortify的警告消息：：ggbiplot

Question

我正在尝试使用来自ggbiplot包的ggfortify。它看起来很好，但我收到了如下警告信息，

mdl <- pls::plsr(mpg ~ ., data = mtcars, scale = T)
scrs <- data.frame(pls::scores(mdl)[])
loads <- data.frame(pls::loadings(mdl)[])

ggfortify::ggbiplot(scrs, loads, 
  label.label = rownames(scrs), asp = 1, label = T, label.size = 3,
  loadings = T, loadings.label = T, loadings.label.label = rownames(loads))

Warning messages:
1: In if (value %in% columns) { :
  the condition has length > 1 and only the first element will be used
2: In if (value %in% columns) { :
  the condition has length > 1 and only the first element will be used

我是否走错了一步，或者是一个错误。

Answer 1

根据ggbiplot文档，label.label=参数期望从其中提取列名；它不需要名称向量。loadings.label.label=也是如此。(ggplot和大多数tidyverse函数都不太喜欢行名--最好是将它们作为一个适当的列)

scrs$ID <- rownames(scrs)
loads$ID <- rownames(loads)
ggfortify::ggbiplot(scrs, loads, 
  label.label = "ID", asp = 1, label = T, label.size = 3,
  loadings = T, loadings.label = T, loadings.label.label = "ID")