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abline outside of plot region
3 messages · Nick Sabbe, Peter Ehlers, Rolf Turner
On 2011-04-29 06:14, Nick Sabbe wrote:
Hi R people. I ran into this problem: I created a plot with errbars, like this:
errbar(x=c(1,2,3,4), y=c(2,1,3,3), yminus=c(1.5,0.5,2.5,2.5),
yplus=c(2.5,1.5,3.5,3.5)) Next, I wanted to accentuate some x value with an abline, like this:
abline(v=2)
In one of my R sessions (which admittedly I have had open for quite a while now), the abline draws outside of the plotting region of errbars (till the edge of my plotting window at least). I tested for the cause by opening another session (clean) of the same version of R (2.13), and running the same set of commands. In this session, I do not have this behavior. Conclusion: I must have changed some graphical parameter in my original session, but I don't know which one. Do you? As an addendum: I also want to add a few specific axis ticks besides the standard ones in my graph. I used axis for this, and it works. I set col.ticks to match the color of my abline (in the nonsimplified code), and this works too, but unfortunately, the label below the tick is not in this color, and a parameter for this is not present in axis. Suggestions for either? Note: I'm on windows 7 with R 2.13.
plot(1:4, xaxt='n')
axis(1, at=2:3, lab=c('a', 'b'),
col.ticks=3, col.axis=2, lwd=0, lwd.ticks=1)
par(xpd = TRUE)
abline(v = 4)
Peter Ehlers
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On 30/04/11 01:14, Nick Sabbe wrote:
Hi R people. I ran into this problem: I created a plot with errbars, like this:
errbar(x=c(1,2,3,4), y=c(2,1,3,3), yminus=c(1.5,0.5,2.5,2.5),
yplus=c(2.5,1.5,3.5,3.5)) Next, I wanted to accentuate some x value with an abline, like this:
abline(v=2)
In one of my R sessions (which admittedly I have had open for quite a while now), the abline draws outside of the plotting region of errbars (till the edge of my plotting window at least). I tested for the cause by opening another session (clean) of the same version of R (2.13), and running the same set of commands. In this session, I do not have this behavior. Conclusion: I must have changed some graphical parameter in my original session, but I don't know which one. Do you?
<SNIP>
I think what has happened is not that *you* changed some graphical
parameter,
but rather that the package Hmisc did. In a rather strange way. (I
*presume*
that you are using the errbar() function out of Hmisc rather than out of the
sfsmisc package --- you didn't say).
For a while I thought that the problem was associated with the
*installation*
of Hmisc, becomes it seemed to happen only on the first occasion after I
did the install, and on later occasions (quit from R, restart, load Hmisc,
try errbar and abline) the problem did not occur.
But then, about the third time I tried the re-install, the problem never
happened
at all. But it ***did*** happen, a couple of times. So you're not
imagining it,
you'll be pleased to know.
I think that if it *does* happen to you again, you can fix it by setting
par(xpd=FALSE)
I checked on par()$xpd a couple of times when the problem occurred,
and got NA, which is consistent with the observed problem.
The whole thing is weird, but. Gremlins?
cheers,
Rolf Turner