Path: utzoo!attcan!utgpu!jarvis.csri.toronto.edu!mailrus!um-math!kevin From: kevin@math.lsa.umich.edu (Kevin Coombes) Newsgroups: comp.lang.postscript Subject: rotate Keywords: rotate, cos Message-ID: <10052@stag.math.lsa.umich.edu> Date: 6 Oct 89 13:46:53 GMT Sender: news@math.lsa.umich.edu Reply-To: kevin@math.lsa.umich.edu (Kevin Coombes) Organization: University of Michigan Math Dept., Ann Arbor Lines: 15 UUCP-Path: {mailrus,umix}!um-math!kevin Since the PostScript command 90 cos returns a non-zero value (at least on the Apple LaserWriter), the command 90 rotate returns a matrix which isn't quite the same as what you'd get by the supposedly equivalent command [ 0 1 -1 0 0 0 ] concat My question is: which of these commands should be preferred, for example, when printing a page in landscape mode? Since the rotate command is supposed to first compute the cosine and then perform the concatenation, shouldn't it even be more efficient to use the concat version? Kevin Coombes