On Sat, 8 Oct 2005, Marc Schwartz wrote: > On Sat, 2005-10-08 at 09:28 -0400, Denis Chabot wrote: >> Hi, >> >> A few times I tried to control the number and position of tick marks >> in plots with the yasp or xasp parameters. For example, a y axis was >> drawn by default with tick marks at 0, 20, 40, 80 and 100. I tried to >> get tick marks every 10 by adding >> >> yasp=(0, 100, 10) >> >> but this had no effect at all. I know I can draw the axis and tick >> marks manually, but often this simple option would suffice if I could >> understand how to make it work. >> >> Thanks in advance, >> >> Denis Chabot > > > I suspect that one problem you are having is that there is no > par("xasp") or par("yasp")....unless these are typos and you are trying > to use par("xaxp") and par("yaxp")?
In any case, (0, 100, 10) is invalid syntax, and c(0, 100, 10) is needed. > There is an 'asp' argument to some of the plot functions (ie. > plot.default), but this has a different intention. > > par("xaxp") and par("yaxp") are not listed as read only pars in ?par, > however, I cannot recall an instance where R does not overwrite the user > settings during the calculation of the axes, whether passed as arguments > to a plot function or set a priori via a par() call. Really? Try > plot(1:100, xaxt="n") > par(xaxp=c(0, 50, 5)) # the value is reset at each plot > axis(1) for how it works (but not inline, which is probably a bug). > If you want explicit control over the tick marks, you will need to use > axis(), perhaps in combination with axTicks(), after using 'xaxt = "n"' > and/or 'yaxt = "n"' in the plot call, depending upon the circumstances. That is usually as easy. -- 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 ______________________________________________ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html