Many thanks to Peter Dalgaard BSA and Uwe Uwe Ligges for their prompt
responses. It turns out xaxp can not be set by par(xaxp = c(x1, x2, n)) as
indicatedd in Help for 'par' document. Both pointed me to the right
direction by setting axes = F or xaxt = "n" in plot() and using
axis(1,
seq=c(0,150,15)) to produce an axis with desired intervals.
Richard
My original question:
> R-Helpers;
>
> This seems simple to set graphic parameter, but I tried
> plot a graph
> with 10 intervals in x axis with par(xaxp = c(0, 150, 10)
> but to no avail:
>
> par(xaxp =c (0, 150, 10))
> plot(age, y18, type="n", ylab="Height (m)",
xlab=" age
> (Yrs)", font
> = 2)
> lines(age, y6, lty = 4, lwd = 2)
> lnes(age, y10, lty = 1, lwd =2)
> lines(age, y14, lty = 2, lwd =2)
> lines(age, y18, lty = 3, lwd = 2)
> abline(v=50)
>
> The plot shown only 3 intervals with tick at 0, 50, 100, and 150. and
>
> > par()$xaxp
> [1] 0 150 3
>
> I use current version Lattice and Grid.
>
> > version
> _
> platform i386-pc-mingw32
> arch i386
> os mingw32
> system i386, mingw32
> status Patched
> major 1
> minor 5.0
> year 2002
> month 05
> day 15
> language R
>
> What did I miss?
>
> Richard
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