1
我下面从ggplot documentationGGPLOT2与ablines仅
的例子这是代码:
library(plyr)
coefs <- ddply(mtcars, .(cyl), function(df) {
m <- lm(mpg ~ wt, data=df)
data.frame(a = coef(m)[1], b = coef(m)[2])
})
p <- ggplot(mtcars, aes(x = wt, y=mpg), . ~ cyl) + geom_point()
p + geom_abline(data=coefs, aes(intercept=a, slope=b))
不过,我想相同的图形与只有“ablines”!没有点! 尝试:
p <- ggplot(mtcars, aes(x = wt, y=mpg), . ~ cyl)
p + geom_abline(data=coefs, aes(intercept=a, slope=b))
给我一个错误:“参数‘ENV’缺失,没有默认值”