Consider this example:
data(tips, package = "reshape")
library(GGally)
pm <- ggpairs(tips, mapping = aes(color = sex), columns = c("total_bill", "time", "tip"))
pm
How do I make the density plots more transparent and remove the black lines?
The GGally
packages seems to have changed a lot recently and I cannot find a working solution
update
I found how to change the alpha with a custom function:
my_dens <- function(data, mapping, ..., low = "#132B43", high = "#56B1F7") {
ggplot(data = data, mapping=mapping) +
geom_density(..., alpha=0.7)
}
pm <- ggpairs(tips, mapping = aes(color = sex), columns = c("total_bill", "time", "tip"),
diag=list(continuous=my_dens))
pm
but the black line still remains.
thanks to @Henrik this is the solution using a custom function
my_dens <- function(data, mapping, ...) {
ggplot(data = data, mapping=mapping) +
geom_density(..., alpha = 0.7, color = NA)
}
pm <- ggpairs(tips, mapping = aes(color = sex), columns = c("total_bill", "time", "tip"),
diag = list(continuous = my_dens))
pm
Examples on how to customize ggpairs
plots can be found in the vignette. See the "Matrix Sections" and "Plot Matrix Subsetting".