[S] Postscript differences between Unix and PC S-PLUS

David Nelson (daven@llnl.gov)
Fri, 24 Jul 1998 10:57:49 -0700

Thanks to all who responded with suggestions, etc., regarding the mysterious
control D in trellis.device(postscript, file="foo.eps", ...) output.

Many pointed out that some postscript printer drivers for Windows have an
option to emit a control D before and/or after a print job, apparently as a
way to reset the printer's memory. At least now I know WHY these control D's
sometimes appear. However, since this was occurring while outputting to a
file, that couldn't have been the problem.

The answer was kindly provided by Stephen Weller at Statsci, who noted that
there is indeed a bug in the older postscript driver used by the postscript
device, wherein a control D is emitted after the postscript for an image. He
also noted that using a graphsheet and then exporting the resulting graph
via the File -> Export Graph... interface uses the NEW postscript driver
(EPSF 3.0 vs. 2.0, according to the header) which does not have this bug.

David O. Nelson
Lawrence Livermore National Laboratory
Box 808, L-452
Livermore CA 94551
(925) 423-8898 (fax: (925) 422-2282)

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