Oops, Mark, bad typo indeed. But yaxp is what I had in my R program and it did not help.
I did obtain control over my tick marks by drawing them myself, as you suggest. But I was curious as to how to use yaxp since the help on "par" gives it as a possible way of controlling ticks. Maybe it should be removed from the help file? Thanks for your help, Denis Le 05-10-08 à 11:16, Marc Schwartz a écrit : > 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")? > > 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. > > 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. > > HTH, > > Marc Schwartz > > > ______________________________________________ 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