R-beta: error in x11 graphics?

[Albrecht Gebhardt]

Hi,

please could somebody try the following lines:

  x<-c(-808996808,-820483729)
  y<-c(1429449991,372653377)
  xrange<-c(-824726000,-820002315)
  yrange<-c(369266958,373990642)

  # only one point should appear because the other lays outside the plot ranges:
  plot(x,y,xlim=xrange,ylim=yrange)

  # this should produce a line directed to the hidden point
  lines(x,y)

If it would work correct, you should get something like this:

+---------------+ 
|           /   |
|          o    |
|               |
|               |
|               |
+---------------+

But my R (0.62.2 on Linux) produces a line downwards, and if I rescale 
the plot, it changes its direction from downwards to right and to upwards.

Whats the matter?

May be a rounding error in the X11 code? 

Postscript versions of this plot are ok: I tried the plot commands from above with

  postscript("/tmp/test1.ps",horizontal=F,height=7,width=7)
  postscript("/tmp/test2.ps",horizontal=F,height=7,width=3)
  postscript("/tmp/test3.ps",horizontal=F,height=3,width=7)
 
and all looked like my sketch above.

Of course, the ratio between the ylim dimensions of the plot and the 
distance in y-direction between the two points is very small (0.004),
but why should it work with postscript only?


Albrecht

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Albrecht Gebhardt          email: albrecht.gebhardt at uni-klu.ac.at
Institut fuer Mathematik   Tel. : (++43 463) 2700/837
Universitaet Klagenfurt    Fax  : (++43 463) 2700/834
Villacher Str. 161         WWW  : http://www-stat.uni-klu.ac.at/~agebhard
A-9020 Klagenfurt, Austria
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