[R] new to the list - problems with non-solid lines in eps export - problem fixed!

Gregor Volberg gregor.volberg at psychologie.uni-regensburg.de
Thu Mar 30 08:27:00 CEST 2006

Hi Uwe,

thanks for the reply! I used postscript() instead of dev.copy2eps(), but the 
problem remained; furthermore, its the same on the screen and in a physical 
After some more testing, I figured out that I can produce the desired output 
if I do not use the pre-defined  line type "dotted", as in 

lines(LL[1:251], type="l", lwd=1, lty="dotted"),

but rather define an own line type as in 

lines(LL[1:251], type="l", lwd=1, lty="11").

With this, dotted lines in the eps output look nice. 
So, thanks again for your help,

Am Sonntag, 26. März 2006 15:16 schrieb Uwe Ligges:
> Gregor Volberg wrote:
> > Dear all,
> > I am new to this list and, unfortunately, could not provide help to
> > anyone as yet. I hope I can do so in the future, though! Until then, I am
> > grateful for helpful hints from you more experienced users.
> >
> > For use in an upcoming publication, I generated an eps figure from  my
> > x11 window under Debian Linux with dev.copy2eps. It contains 28 line
> > plots with 2 lines each, one solid and one dotted (they show
> > event-related brain potentials in two different conditions, if this is of
> > interest for someone). The plots are arranged in a window with width=5
> > inch and height = 6 inch, so single plots are quite small.
> > Now the problem: When I include the file in Latex or other word
> > processing programs, the dotted line is almost unreadable. The whole
> > waveform consists of, say, 20 dots, which hardly form a curve. The same
> > problem occurs under MS Windows with dev.copy2eps(). However, when I
> > directly plot the device under Windows, the dotted lines are nice. Thus,
> > the problem is presumably special to eps "export".
> > I know that I could do an easy workaround by using thick/thin lines or
> > black/grey ones, but publication offices say that such lines are hard to
> > distinguish for the reader in the final print version. Also, I searched
> > this list for  something like "high resolution plots", but I learend that
> > eps as a vector format does not have a fixed resolution (and thus no
> > option to make ist "higher"). Plotting the figure to another device (png,
> > bmp) reveals  the expected curves, but bitmaps are often not accepted.
> > Does anyone have a hint, or does anyone have the same problem? Thank you
> > in advance for your help!
> 1. Use postscript() directly rather than the way through dev.copy2eps()
> (which should work as well, but let us exclude it for further reference).
> 2. Print the resulting postscript physically rather than looking at it
> on the screen. Omitting some points might be caused by some settings of
> your postscript viewer.
> Uwe Ligges
> > Gregor
> >
> >
> > P.S.: The dotted lines are not fuzzy, but "stretched" in the way that the
> > point are to far away from each other to appear continuos. The same is
> > with other non-solid lines (dashed etc).

Dr. rer. nat. Gregor Volberg <gregor.volberg at psychologie.uni-regensburg.de>
Institute for Experimental Psychology
University of Regensburg
Universitätsstraße 31
D-93053 Regensburg
Tel: +49 941 943 3862 
Fax: +49 941 943 3233
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