[R] how to control ticks in plots with yasp or xasp

[Peter Dalgaard]

Denis Chabot <chabotd at globetrotter.net> writes:

> 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?

plot(1)
par("xaxp")
par(xaxp=c(.6,1.4,8))
axis(3)

So it does do something...

 
> 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
> >
> >
> >
> 
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