在ggpairs图中更改标签

Question

我有以下代码：

library(GGally)
group <- c("b", "c", "d", "c", "d", "b", "d", "c", "b", "c", "d", "c", "d", "b", "d", "c")
one <- c(123, 174, 154, 143, 184, 134, 165, 192, 123, 174, 154, 143, 184, 134, 165, 192)
two <- c(223, 274, 254, 243, 284, 234, 265, 292, 223, 274, 254, 243, 284, 234, 265, 292)
three <- c(323, 374, 354, 343, 384, 334, 365, 392, 323, 374, 354, 343, 384, 334, 365, 392)
four <- c(423, 474, 454, 443, 484, 434, 465, 492, 423, 474, 454, 443, 484, 434, 465, 492)
df <- data.frame(group, one, two, three, four)
p <- df %>% ggpairs(.,
                    mapping = ggplot2::aes(colour=group),
                    lower = list(continuous = wrap("smooth")),
                    diag = list(continuous = wrap("blankDiag"))
)
getPlot(p, 1, 5) + guides(fill=FALSE)
plots = list()
for (i in 1:5){
  plots <- c(plots, lapply(2:p$ncol, function(j) getPlot(p, i = i, j = j)))
}  
p <- ggmatrix(plots, 
              nrow = 5,
              ncol=p$ncol-1, 
              xAxisLabels = p$xAxisLabels[2:p$ncol], 
              yAxisLabels = p$yAxisLabels, 
)
p

这是输出。

我希望以不同的顺序显示这些组。我可以通过替换dataframe的group列中的字符串来做到这一点：

df$group = str_replace_all(df$group,"b","2-b")
df$group = str_replace_all(df$group,"c","1-c")
df$group = str_replace_all(df$group,"d","3-d")

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这使事情按我想要的顺序排列，但是标签变成了"1-c"，"2-b"，“3d”，因为我改变了一些值。在保留新顺序的同时，是否可以将情节中的"1-c“、"2-b”、"3-d“分别替换为"c”、"b“、"d”？还是有别的解决办法？

Answer 1

与其更改值，不如将group更改为因子，并更改级别：

df$group = factor(df$group, levels = c("c","b","d"))

# the rest is unchanged:
p <- df %>% ggpairs(.,
                    mapping = ggplot2::aes(colour=group),
                    lower = list(continuous = wrap("smooth")),
                    diag = list(continuous = wrap("blankDiag"))
)
getPlot(p, 1, 5) + guides(fill=FALSE)
plots = list()
for (i in 1:5){
  plots <- c(plots, lapply(2:p$ncol, function(j) getPlot(p, i = i, j = j)))
}  
p <- ggmatrix(plots, 
              nrow = 5,
              ncol=p$ncol-1, 
              xAxisLabels = p$xAxisLabels[2:p$ncol], 
              yAxisLabels = p$yAxisLabels, 
)
p

​

​

这样，您可以保留值，但更改它们在ggplot中的出现顺序。

Answer 2

您可以手动指定您想要的顺序如下：

df$group <- factor(df$group, levels = c("c", "b", "d"))

我想这就是你想要的

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