[R] postscript problem

[Mathieu Ros]

hello all,
when trying to produce a plot with the following code

postscript("g6-5000-0705-b.ps")
par(mfrow=c(4,1))
for (i in 1:4) {
  somc<-cumsum(betaC[,i])/c(1:N)
  plot(somc,ylim=c(min(somc),max(somc)));
}
dev.off()

I get a postscript file g6-5000-0705-b.ps, but if I try to open it
with ghostscript, or to convert it to pdf, I get the following error :

Error: /invalidfont in findfont
Operand stack:
   Helvetica   Font   Helvetica   236270   Helvetica   --nostringval--   Courier   NimbusMonL-Regu
Execution stack:
   %interp_exit   .runexec2   --nostringval--   --nostringval--   --nostringval--   2   %stopped_push   --nostringval--   --nostringval--   --nostringval--   false   1   %stopped_push   1   3   %oparray_pop   .runexec2   --nostringval--   --nostringval--   --nostringval--   2   %stopped_push   --nostringval--   1   3   %oparray_pop   2   3   %oparray_pop   --nostringval--   --nAladdin Ghostscript 6.0: Unrecoverable error, exit code 1
ostringval--   --nostringval--   --nostringval--   --nostringval--   false   1   %stopped_push   5   4   %oparray_pop   --nostringval--   --nostringval--   --nostringval--   1   -1   1   --nostringval--   %for_neg_int_continue   --nostringval--   --nostringval--
Dictionary stack:
   --dict:946/983(ro)(G)--   --dict:0/20(G)--   --dict:90/200(L)--   --dict:16/24(G)--   --dict:946/983(ro)(G)--
Current allocation mode is local
Last OS error: 2
Current file position is 1105
Error: PostScript interpreter failed in main window.


Any idea of what's happening ?
thanks,
 Mathieu

-- 
Mathieu Ros
DEA Mathématiques Appliquées
Laboratoire de Génétique Cellulaire
INRA-Toulouse [05 6128 5119]

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