[R] plotting with line types... bit confusing

R. Michael Weylandt michael.weylandt at gmail.com
Sat Mar 24 14:32:44 CET 2012

The command is type = "l" not "lines"....

If you want linear interpolation (which may or may not be the right
thing for an ecdf), you'll have to do a bit more work since you aren't
passing plot a set of points.

x <- ecdf(rnorm(500))

I've packaged it all up in a function for you because it requires some

plotECDFLinearInterp <- function(e, type = c("l", "s"), ...){
    stopifnot(inherits(e, "ecdf"))

    x <- environment(e)$x
    y <- environment(e)$y

    plot(x,y, type = match.arg(type), ...)

Note that you may wish to change the type to "s" or "S" to get a step
function (arguably also the right interpolation for an ECDF)


On Sat, Mar 24, 2012 at 6:56 AM, Alaios <alaios at yahoo.com> wrote:
> Dear all,
> I would like to print an empirical cdf on a vector I have
> while the plot(ecdf(myVector)) works great when I try to specify the line type to be a line (I get points) with
> plot(ecdf(myVector),type="lines")
> Error in plot.default(NA, NA, type = "n", xlim = xlim, ylim = ylim, xlab = xlab,  :
>   formal argument "type" matched by multiple actual arguments
> I get this error message.
> Why this happens and how should I next time interpret the error massage?
> Regards
>        [[alternative HTML version deleted]]
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