R devel - Jan 2005 - R 'postscript' plot - not a valid postscript (PR#7559)

Full_Name: Mr. Daniel Murray Bolser
Version: R 2.0.0 (2004-10-04)
OS: Linux beagle 2.4.20-31.9 #1 Tue Apr 13 17:38:16 EDT 2004 i686 athlon i386
GNU/Linux
Submission from: (NULL) (193.60.81.207)



Trying to execute the following code produces a 'not a valid postscript'
error
from various postscript readers (gv, ggv, ghostscript). A very similar code
works fine.

<CODE>

postscript()

plot( 1:100, ylim=c(1,700), type='n', log='y')

abline(v=seq(0,100,10))
abline(h=10)
abline(h=seq(0,100, 10)) # Comment out this line and it works fine

dev.off()

</CODE>




Opening the resulting file 'Rplots.ps' gives the following error from
ghostscript (version 7.05)...


GNU Ghostscript 7.05 (2002-04-22)
Copyright (C) 2002 artofcode LLC, Benicia, CA.  All rights reserved.
This software comes with NO WARRANTY: see the file PUBLIC for details.
Loading NimbusRomNo9L-Regu font from
/usr/share/fonts/default/Type1/n021003l.pfb... 2410668 1054394 1642520 347466 0
done.
Loading NimbusSanL-Regu font from /usr/share/fonts/default/Type1/n019003l.pfb...
2785628 1380272 1662616 358654 0 done.
Using NimbusSansL-Regu font for NimbusSanL-Regu.
Loading NimbusSanL-Bold font from /usr/share/fonts/default/Type1/n019004l.pfb...
3070120 1592924 1702808 364331 0 done.
Loading NimbusSanL-ReguItal font from
/usr/share/fonts/default/Type1/n019023l.pfb... 3187264 1694142 1702808 369303 0
done.
Loading NimbusSanL-BoldItal font from
/usr/share/fonts/default/Type1/n019024l.pfb... 3284312 1740192 1702808 354427 0
done.
Loading StandardSymL font from /usr/share/fonts/default/Type1/s050000l.pfb...
3324504 1781043 1702808 358380 0 done.
Error: /undefined in nan
Operand stack:
   77.04
Execution stack:
   %interp_exit   .runexec2   --nostringval--   --nostringval--  
--nostringval--   2   %stopped_push   --nostringval--   --nostringval--  
--nostringval--   false   1   %stopped_push   1   3   %oparray_pop   1   3  
%oparray_pop   1   3
%oparray_pop   .runexec2   --nostringval--   --nostringval--   --nostringval--
 2   %stopped_push   --nostringval--   --nostringval--   --nostringval--
Dictionary stack:
   --dict:1049/1123(ro)(G)--   --dict:0/20(G)--   --dict:108/200(L)--
Current allocation mode is local
Current file position is 4083
GNU Ghostscript 7.05: Unrecoverable error, exit code 1



Looking at this just now I see the problem, but if a ps file is written, it
should be viewable, so I think this is still a bug.

Cheers,
Dan.

dan@bolser.co.uk writes:
> Full_Name: Mr. Daniel Murray Bolser
> Version: R 2.0.0 (2004-10-04)
> OS: Linux beagle 2.4.20-31.9 #1 Tue Apr 13 17:38:16 EDT 2004 i686 athlon
i386 GNU/Linux
> Submission from: (NULL) (193.60.81.207)
> 
> 
> 
> Trying to execute the following code produces a 'not a valid
postscript' error
> from various postscript readers (gv, ggv, ghostscript). A very similar code
> works fine.
> 
> <CODE>
> 
> postscript()
> 
> plot( 1:100, ylim=c(1,700), type='n', log='y')
> 
> abline(v=seq(0,100,10))
> abline(h=10)
> abline(h=seq(0,100, 10)) # Comment out this line and it works fine
> 
> dev.off()
> 
> </CODE>
> 
Just abline(h=0) gives the same effect, with the following in the
postscript file

77.04 nan m
716.61 nan l

which of course comes from trying to calculate log10(0).

> Looking at this just now I see the problem, but if a ps file is written, it
> should be viewable, so I think this is still a bug.
Yes. However, the workaround would be rather obvious...

-- 
   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