在GGally :: ggpairs中编辑单个ggplots：如何在ggpairs中填充密度图？

Question

使用

library(GGally)

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

# Custom Example
ggpairs(
 diamonds.samp[,1:5],
 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"
)

我得到了

如何使对角线密度图不被填充，只显示线条？

有点作品......但不是真的。

这在代码方面真的很难看 - 因为它对我来说没有任何意义。此外，它在这里不起作用，因为它也改变了直方图。

ggpairs(
  diamonds.samp[,1:5],
  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"), mapping = ggplot2::aes(fill=carat)),
  title = "Diamonds"
)

Answer 1

问题的答案可以在https://cran.r-project.org/web/packages/GGally/vignettes/ggpairs.html（archived here）

上找到

ggally_mysmooth <- function(data, mapping, ...){
  ggplot(data = data, mapping=mapping) +
    geom_density(mapping = aes_string(color="cut"), fill=NA)
}
ggpairs(
  diamonds.samp[,1:5],
  mapping = 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 = ggally_mysmooth),
  title = "Diamonds"
)