R help - May 2004 - plotting in R

Hi there, I have 2 questions which I cannot find answers for in Dalgaard 
or the helpfiles currently available.

(1) I wish to plot 3 ecdf plots on one graph.  Is there any way of 
holding a figure to plot all on the same plot.  I can't get an ecdf for 
any plot command other than "plot" or "ecdf.plot" so using
lower level
command is no good, have also tried x11().

(2) If I have three curves on a plot how can I label each curve so the 
label sits directly above the curve?

Thanks

Carla

Karla Meurk wrote:
> Hi there, I have 2 questions which I cannot find answers for in Dalgaard 
> or the helpfiles currently available.
> 
> (1) I wish to plot 3 ecdf plots on one graph.  Is there any way of 
> holding a figure to plot all on the same plot.  I can't get an ecdf for
> any plot command other than "plot" or "ecdf.plot" so
using lower level
> command is no good, have also tried x11().
Not familiar with plotting ecdf objects, but the following might be 
helpful...

a)  str() to find the structure of the ecdf object (if the help page for 
ecdf's "Value" section isn't clear enough), then use
"lines" to put the
lines on.

b) par(new=TRUE), before replotting, then plot(..., xaxt="n",
yaxt="n")
to prevent re-drawing the axes.
> (2) If I have three curves on a plot how can I label each curve so the 
> label sits directly above the curve?
?text.  To select where the text goes, you can work out the 
co-ordinates, or use mouse clicks, as in...

text(locator(1),"Curve 1")
text(locator(1),"Curve 2")
...

and click at the points you want the text.

Cheers

Jason