0

I'm quite a beginner at using R for visualization of data. I've generated comulative distribution chart with following code:

if (length(first$dtl) > 0) {first_cdf <- ecdf(first$dtl)} else first_cdf <- 0
cdf_range <- range(0, first$dtl, na.rm=TRUE)
plot(first_cdf, main="Distribution", xlab="Values", xlim=cdf_range, col="#76B727", cex.axis=0.8, pch=20)

With this I get

enter image description here

Now issue is that I would like to get clear line instead of dots connected with line. I've tried to change pch as well as lty parameter, but it seems there is no way to get clear line with those. Any idea how to solve this issues?

Thank you and best regards!

Frank
  • 66,179
  • 8
  • 96
  • 180
Bostjan
  • 1,455
  • 3
  • 14
  • 22
  • Hello Frank! Cheers for reponse. As I've stated, I've tested different pch and lty parameters (http://www.statmethods.net/advgraphs/parameters.html), but I still can not get desired result, which is clear line. It becomes an issue when I add more lines to plot (more distributions) and it becomes very hard to spot which line is what. – Bostjan Sep 18 '15 at 14:41

1 Answers1

1

This disables the dots and adds vertical lines to make it continuous:

set.seed(1)
plot(ecdf(rnorm(100)), do.points=FALSE, verticals=TRUE)

enter image description here

Type plot.ecdf in at the R prompt to see the full function or ?plot.ecdf for the help file (which directs further to ?plot.stepfun). Even though you are calling vanilla plot, the plot.ecdf function is what's used, thanks to R's method dispatch, ?Methods.

Frank
  • 66,179
  • 8
  • 96
  • 180