Turn off dotted lines in plot.ecdf()

Question

Plotting an ecdf object in R produces a nice empirical distribution function. E.g:

x = seq(1,10,1)
ecdf1 = ecdf(x)
plot(ecdf1,verticals=TRUE, do.points=FALSE)

However, the default behavior produces a figure with horizontal dotted lines at 0 and 1. I don't see an option to turn off this behavior in plot.ecdf() or in the underlying call to plot.stepfun(). Right now, I'm literally drawing a white line overtop the dotted lines.

Surely there's a way to turn off drawing these dotted lines?

Miyamoto

Answer 1

Try:

plot(ecdf1,verticals=T, do.points=F,col.01line = NULL)

Reasoning: I used getAnywhere("plot.ecdf") and found the line abline(h = c(0, 1), col = col.01line, lty = 2). That's the cause. Since it uses col.01line as its input for color, we simply set the color to NULL.

Benedict

Good work, although sometimes you can just read the help page. In base-graphics the argument to a col parameter can also be "transparent". – Rumanian

Thanks, and nice explanation on how you found the solution! Not sure how I missed that one. – Miyamoto