Add a dotted vertical line on certain x-axis values using ggplot
axis values are -6,-4,-2, 0, 2,4, 6 with some y values in a density plot. Is it possible to Add dotted vertical lines on certain x-axis values (Forex: -3 and +3 )using ggplot ?
library(ggplot2)
df <- data.frame(x = rnorm(1000, 0, 1), y = rnorm(1000,
0, 2), z = rnorm(1000, 2, 1.5))
df.m <- melt(df)
ggplot(df.m) + geom_freqpoly(aes(x = value,
y = ..density.., colour = variable))
Solution 1:
Try geom_vline:
ggplot(df.m) +
geom_freqpoly(aes(x=value, y=..density.., colour=variable)) +
geom_vline(xintercept=c(-3,3), linetype="dotted")
