R help - Jun 2002 - function plot.double (different data on the same plot)

Hi,

I would like to plot on the same graph vertical lines from points of two 
different data sets to the zero axis 
(x1,y1) and (x2,y2) (y1>0, y2<0)

I tried to use function plot.double from Anne York,

plot.double(x1, y1, x2, y2, type1="h", type2="h")

but I obtain two different zero axis, and I wanted 
to plot vertical lines from data points to the same zero axis

Any suggestions?

Thank you!


Susana Barbosa
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Hi,

On Thu, 20 Jun 2002, Susana Barbosa wrote:

  |Hi,
  |
  |I would like to plot on the same graph vertical lines from points of two 
  |different data sets to the zero axis 
  |(x1,y1) and (x2,y2) (y1>0, y2<0)

I am not quite sure what you want, but the example below gives a picture
which perhaps is good enough.  Note that lines() can be used not only for
lines:

x <- rnorm(10)
y <- rnorm(10)
plot(1:10,x, type="h", ylim=range(c(x,y))) # plot x against 1:10
lines(1:10+0.1,y, type="h", col=2)         # plot y shifted a bit
right

Perhaps it helps

Ott

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