Hi, sorry about the bad syntax, though the right syntax would not have worked either, according to your tests (Mark, Brian, Peter).
Anyway it is too finicky, I will draw them myself. For instance, plot(1:100, xaxt="n") par(xaxp=c(0, 100, 10)) # the value is reset at each plot axis(1) Placed tick marks at intervals at 0, 10, ..., 100, as expected, but did not place a label under 100... Thanks for the answers, usufull as always, Denis Le 05-10-08 à 11:58, Marc Schwartz a écrit : > On Sat, 2005-10-08 at 16:37 +0100, Prof Brian Ripley wrote: > >> 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. >> > > Indeed. > > >>> 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). >> > > Ah....I had not thought about that 'par'ticular combination... ;-) > > Hence, not R.O. So it must be used _after_ a plot call, which makes > sense. > > I had reached for my copy of Paul's book and on page 96 (last > paragraph > in section 3.4.5 on Axes), he suggests using the approach I elucidate > below with axTicks(). I thought he might have some other ideas and > that > I was missing something. This is also referenced on page 70, third > paragraph in section 3.2.5 on Axes. > > >>> 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. >> > > Agreed. > > Thanks, > > Marc > > > ______________________________________________ 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