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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