R help - Dec 2010 - How can I draw a line in empirical distribution function?

I've got the graphic with this:
a=c(120,40,75,85,55,75,55,90,90,55,155)
plot(ecdf(a))

How can I draw lines to show the lower quatile and upper quartil?

I only know there is the argument lines(),

but I don't know how to use it
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I believe that functions
yline {fields}
xline {fields}
are what you?re looking for
try to type
yline(c(.25,.75))
That shoud do that
Best Regards
Zbynek Janoska
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zbynek.janoska at gmail.com wrote:
> 
> I believe that functions
> yline {fields}
> xline {fields}
> are what you?re looking for
> try to type
> yline(c(.25,.75))
> 
It work, but one should avoid pulling in a special package for such a job.
xline is defined as

function (x, ...) 
{
    abline(v = x, ...)
}

so better use abline.

Dieter



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