300 dpi and eps:

Everything works fine to place them in a pdf file , or eps file, but
when it comes to have a high quality of 300 dpi these graphs are not
good. For example I open the eps file with Adobe Illustrator (AI)
and it shows that it is a 72dpi graph.

This is simply not true: it's an eps and thus of essentually infinite
resolution for all practial purposes. So your problem is not with 
the R-generated eps but somewhere downstream from that. Any
postprocessing, conversion or editing?

cu
	Philipp

Dr. Philipp Pagel
Lehrstuhl f?r Genomorientierte Bioinformatik
Technische Universit?t M?nchen
Wissenschaftszentrum Weihenstephan
Maximus-von-Imhof-Forum 3
85354 Freising, Germany
http://webclu.bio.wzw.tum.de/~pagel/