Hi there, I did what Peter Dalgaard very kindly suggested and saved it as a pdf and viewed it using adobe, which as if by magic resolves the problem. It must have been a pixel issue with the r graphics device. Sorry to have wasted your time, thanks for your help, always appreciated. Simon.
> 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 > Simon Pickett PhD student Centre For Ecology and Conservation Tremough Campus University of Exeter in Cornwall TR109EZ Tel 01326371852 ______________________________________________ [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.
