orientation of eps files

hello,

i have a problem with the orientation of eps files produced with the postscript() command. i have generated some eps files with R using:

postscript(file = filename, horizontal = FALSE, paper = "special", onefile = F
ALSE, height = height, width = width, pointsize = pointsize)

now, when i include these eps files into a standard paper document (ie. a4 paper, portrait orientation) everything is fine.

however, i am now wanting to incorporate the same images into a presentation. i am making a pdf file, which for presentation purposes is in landscape orientation. i am using latex with the prosper package. images are included with \includegraphics{} and a pdf file is generated with dvipdf. however, in this case, when i include the eps figures the whole page suddenly gets rotated around into portrait. eps files from other packages seem to work fine.

there is an example of the problem at ftp://chinstrap.nu.ac.za/orientation.pdf.

if you have any ideas as to what might be causing this problem, i would be extremely happy to hear them.

best regards,
andrew.

Andrew B. Collier

Antarctic Research Fellow                                   tel: +27 31 2601157
Space Physics Research Institute                            fax: +27 31 2616550
University of KwaZulu-Natal, Durban, 4041, South Africa