Controlling the extent of ablines on plot

Hi Ryan,

The issue is the plotting region is slightly padded.  The easiest
option, I think, would be to clip() it.  I have a general sense that
one of the par() options would let you adjust the padding to 0, but I
could just be imagining that (anyone else??).  Anyway, here are some
options:

###
plot(0:5, seq(0, 10, 2), axes=FALSE)
axis(1, at=c(0,1,2,2.5,3,4,5), pos=0)
axis(2, at=seq(0, 10, 2), pos=0)
## using clip and abline
clip(0, 5, 0, 10)
abline(h = 1:5)
dev.new()
plot(0:5, seq(0, 10, 2), axes=FALSE)
axis(1, at=c(0,1,2,2.5,3,4,5), pos=0)
axis(2, at=seq(0, 10, 2), pos=0)
## using lines, but without retyping as much
sapply(1:5, function(y) lines(c(0, 5), c(y, y)))
## or even easier, getting the same thing with segments
segments(0, 1:5, 5, 1:5)

HTH,

Josh

Well... that could work. Problem is in the actual graphs I'm making, there
are to be >30 lines per graph (as many as 60 in some cases). Any way I could
use the lines command without having to write out 60 lines of code per
figure? That's why I like ablines; you just have to specify a single value
and it will put a horizontal line at that number.

Thanks,
Ryan

Maybe you could use lines()?

plot(1:2)
lines(c(1,2),c(1.5,1.5))

--

Ryan Utz, Ph.D.
Aquatic Ecologist/STREON Scientist
National Ecological Observatory Network

Home/Cell: (724) 272-7769
Work: (720) 746-4844 ext. 2488

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