遵循给出的建议
here
# Load library
library(ggplot2)
# Load data
data(mtcars)
# Vector of smoothing methods for each plot panel
meths <- c("loess","lm","lm","lm","lm","lm","lm")
# Smoothing function with different behaviour in the different plot panels
mysmooth <- function(formula,data,...){
meth <- eval(parse(text=meths[unique(data$PANEL)]))
x <- match.call()
x[[1]] <- meth
eval.parent(x)
}
# Plot data
p <- ggplot(mtcars,aes(x = disp, y = mpg)) + geom_point() + facet_grid(gear ~ am)
p <- p + geom_smooth(method="mysmooth")
print(p)