[Rd] problem with plot(...., xlim=c(5,0)) (PR#480)

[Peter Dalgaard BSA]

Martin Maechler <maechler@stat.math.ethz.ch> writes:

> >>>>> "BDR" == Prof Brian Ripley <ripley@stats.ox.ac.uk> writes:

>     >> plot(1:4,1:4,xlim=c(5,0),ylim=c(5,0))
>     >> 
>     >> shows axis labels as:
>     >> 
>     >> |    |    |    |    |     |
>     >> 0
>     >> rather than
>     >> |    |    |    |    |    |
>     >> 5    4    3    2    1    0
>     >> 
>     >> as I believe it used to do in some earlier version.
> 
>     BDR> Up to 0.64.2, not since 0.65.0.
> 
> No, unfortunately,  happens here with 1.0.0 (even patched; "R-release")
> 

I think Brian meant that it hasn't done the  5 4 3 2 1 thing since
0.64.2...  

In general, it can be argued that the reversed xy limits are not safe
and shouldn't be, since things are likely not to work at the device
level with a mirrored coordinate system (I.e.: if we decide that it
should work, we may find ourselves fixing lots of small glitches in
devxxx.c). 

Plotting (5-x,5-y) and doing the axes with axis(n, at=0:5, labels=5:0)
will get the plot done in a cleaner, albeit more cumbersome fashion.

-- 
   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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