如何更改GGally :: ggpairs的调色板？

Question

这与问题相同 User defined colour palette in R and ggpairs或is there a way to change the color palette for GGally::ggpairs using ggplot?

只有那里的解决方案不再有效。

我也想更改调色板，但is there a way to change the color palette for GGally::ggpairs using ggplot?不再起作用了。怎么办？

MWE：

library(GGally)
library(ggplot2)
data(diamonds, package="ggplot2")
diamonds.samp <- diamonds[sample(1:dim(diamonds)[1],200),]
ggpairs(
  diamonds.samp[,1:2],
  mapping = ggplot2::aes(color = cut),
  upper = list(continuous = wrap("density", alpha = 0.5), combo = "box"),
  lower = list(continuous = wrap("points", alpha = 0.3), combo = wrap("dot", alpha = 0.4)),
  diag = list(continuous = wrap("densityDiag")),
  title = "Diamonds"
)

我想添加

scale_colour_manual(values=c('red','blue','green','red','blue'))

（显然这只是虚拟代码）并获得类似的东西（我没有绘制所有点）：

Answer 1

一种解决方案是从ggmatrix中添加新的scale_提取每个图，然后将其重新分配给矩阵。

实施例

library(GGally)
library(ggplot2)
data(diamonds, package="ggplot2")
diamonds.samp <- diamonds[sample(1:dim(diamonds)[1],200),]

p <- ggpairs(
  diamonds.samp[,1:2],
  mapping = ggplot2::aes(color = cut),
  upper = list(continuous = wrap("density", alpha = 0.5), combo = "box"),
  lower = list(continuous = wrap("points", alpha = 0.3), combo = wrap("dot", alpha = 0.4)),
  diag = list(continuous = wrap("densityDiag")),
  title = "Diamonds"
)

循环遍历每个图表，更改相关比例

for(i in 1:p$nrow) {
  for(j in 1:p$ncol){
    p[i,j] <- p[i,j] + 
        scale_fill_manual(values=c("red", "blue", "green", "yellow", "black")) +
        scale_color_manual(values=c("red", "blue", "green", "yellow", "black"))  
  }
}

p

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