I want to draw a a horizontal line at 0 parallel to X-axis.
I looks like you are using the base plotting function so you would use the abline function to add a line to the plot. Using the h parameter adds a horizontal line with the given y intercept.
DF <- data.frame(X = 1:20, Y = runif(n = 20, min = -5, max = 5)) plot(DF$X, DF$Y) abline(h = 0)
Created on 2020-06-11 by the reprex package (v0.3.0)
geom_hline() with yintercept will add horizontal line. https://ggplot2.tidyverse.org/reference/geom_abline.html
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