[Rd] abline and log plots (PR#1243)

[Peter Dalgaard BSA]

stephen@cogsci.ed.ac.uk writes:

> Full_Name: Stephen Eglen
> Version: 1.4
> OS: Redhat Linux 7.1
> Submission from: (NULL) (128.252.204.36)
> 
> 
> abline() produces a spurious line in addition to the correct line, at least with
> 
> the X11 driver.  The postscript file generated also has nan values in it, which
> causes an error under ghostscript.
> 
> xs <- c(0, 150, 300)
> ys <- c(75, 40, 23)
> par(mfrow=c(1,2))
> plot(xs,ys, log="")
> abline(70, -0.25, -.1, untf=F)
> plot(xs,ys, log="y")
> abline(70, -0.3, -.1, untf=T)
> dev.copy2eps(file="abline.ps")

Still in the development version too. Notice that it is log="y" +
untf=T that is causing the trouble. Looks like the clipping algorithm
is getting confused.

A fairly straightforward workaround is 

plot(xs,ys, log="y")
curve(70-0.3*x,add=T)


-- 
   O__  ---- Peter Dalgaard             Blegdamsvej 3  
  c/ /'_ --- Dept. of Biostatistics     2200 Cph. N   
 (*) \(*) -- University of Copenhagen   Denmark      Ph: (+45) 35327918
~~~~~~~~~~ - (p.dalgaard@biostat.ku.dk)             FAX: (+45) 35327907
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