It would be very helpful to have a reproducible example, including the OS and graphics device used.
For example, this may only happen with certain values of 'pch' -- e.g. some graphics devices (pdf is one) plot circles using completely different code from squares. And we frequently see reports of problems with R graphics where the bug is in the viewer software or the including application (Word being notorious for mis-rendering WMF files). On Fri, 20 Oct 2006, Peter Dalgaard wrote: > "Simon Pickett" <[EMAIL PROTECTED]> writes: > >> Hello everyone, >> I have successfully made an error bar graph using the points() command >> with the arrows() command to maually add on the standard errors. >> >> However, one slightly annoying feature of using this method is that the >> points dont line up exactly with the arrows (if you look carefully the >> points are never perfectly in the centre of the arrow), even when you move >> the arrows around in an attempt to correct this. > > Is this a pixelization issue? If the line is an odd number of pixels > wide and the point is an even number of pixels across, then there is > just no way to line them up. It should go away with increased > resolution, e.g. when plotting to pdf() and printing on a laser > printer. > >> Secondly I cant seem to force the points to appear on top of the arrows >> i.e. with the arrows behind the points. Uing ADD=TRUE to either command >> wont work. > > Plot the points last and use a filled symbol, or pch %in% 21:25 with > bg="white". (example(points) is generally helpful in these matters) > >> Does anyone have any solutions to this problem, or maybe even a different >> way of making error plots? >> >> Sorry if this seems a bit pedantic, but it would be great if I could >> resolve this problem and so enable me to use R for publication standard >> graphs... >> >> Thanks everyone :-) > > > > -- Brian D. Ripley, [EMAIL PROTECTED] Professor of Applied Statistics, http://www.stats.ox.ac.uk/~ripley/ University of Oxford, Tel: +44 1865 272861 (self) 1 South Parks Road, +44 1865 272866 (PA) Oxford OX1 3TG, UK Fax: +44 1865 272595 ______________________________________________ [email protected] mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
