What I don't like about type="b", also suggested by Paul Smith, is
that the segments do not go right up to the little circles---a gap is
left, which I don't like. So far, Uwes' solution is what suits me
best. However, I understand Brian's objection, though it doesn't
apply in my case. The discussion makes me fear that it's a very long
road ahead before I can get fine control of R graphics.
Thanks
David
On 20 Jul, 2008, at 14:54, Prof Brian Ripley wrote:
On Sun, 20 Jul 2008, Uwe Ligges wrote:
You probably want to make your code readable, read ?points and go
ahead by making the plot without points (plot(....., type="n")),
drawing segments and at the end paint points with white background
colour in order to "overwrite" the segments:
Except that the background is not necessarily white (and you may
want it to be transparent or translucent).
It looks to me like lines(type="b") might be what was wanted.
y <- c(1.21, 0.51, 0.14, 1.62, -0.8,
0.72, -1.71, 0.84, 0.02, -0.12)
ybar <- mean(y)
ll <- length(y)
ybarv <- rep(ybar, ll)
x <- 1:ll
plot(x, ybarv, type="n")
segments(x[1], ybar, x[ll], ybar)
points(x, ybarv, pch=21, bg="white")
Uwe Ligges
David Epstein wrote:
Please excuse me for asking such basic questions:
Here is my code
y=c(1.21,0.51,0.14,1.62,-0.8,0.72,-1.71,0.84,0.02,-0.12)
ybar=mean(y)
ll=length(y);
ybarv=rep(ybar,ll)
x=1:ll
plot(x,ybarv,pch=1)
segments(x[1],ybar,x[ll],ybar)
What I get is a collection of small circles, with a segment "on
top" of the circles, which is almost what I want. But I don't
want the segment to be visible inside any small circle.
Is there an easy way to arrange for the segment to "lie behind"
the pch=1 markers, as in hidden line removal, so that the circles
remain with nothing inside them? I tried putting the segments
command first, but then no segment appeared at all.
In general, is there a method of laying a drawing "on top" of
another. I tried inserting add="T" as an argument to plot, and R
objected strongly.
Thanks for any help
David Epstein
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______________________________________________
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--
Brian D. Ripley, [EMAIL PROTECTED]
Professor of Applied Statistics, http://www.stats.ox.ac.uk/~ripley/
University of Oxford, Tel: +44 1865 272861 (self)
1 South Parks Road, +44 1865 272866 (PA)
Oxford OX1 3TG, UK Fax: +44 1865 272595
______________________________________________
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PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
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