[R] Axes Ticks

[Dirk Eddelbuettel]

On Thu, Jan 22, 2004 at 01:32:29PM -0500, ivo welch wrote:
> 
> Apologies, basic question on plot.
> 
> 	y <- c(-4,3,-2,1);
> 	x <- c("time 1", "time 2", "time 3", "time 4");
> 	plot(x,y, type="b");
> 
> of course fails.
> 	x <- 1:4
> makes it succeed, but then I have too many ticks on my X axis.  I want 
> exactly 4 tickmarks.  It would also be nicer if I could name the ticks.
> 
> I looked at ?par and Venables&Ripley, and tried the lab and xaxp 
> parameters.  I could not figure out how to use them productively.  could 
> someone please let me know?  help appreciated.  /iaw

y <- c(-4,3,-2,1)
xlab <- c("time 1", "time 2", "time 3", "time 4")
x <-1:4
plot(x,y, type="b", axes=FALSE)
axis(2)
axis(1, at=x, labels=xlab) 
box()				     

If you use 'axis(1, at=x)' you can do without xlab, but get only the bare
numbers. box() is needed to frame the whole thing as the default axes=TRUE
for plot() does.

Gruss,  Dirk

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