par(xaxp)

I don't understand why this doesn't work:

----
plot(c(0,1),c(0.2,0.3),xaxt="n")
axis(1,xaxp=c(0,1,4))
----

Or why this (more obvious to me) doesn't work:

----
plot(c(0,1),c(0.2,0.3),xaxp=c(1,0,4))
----

(I still get 5 intervals on the x-axis)

This has bothered me for months.  I still don't understand why I
shouldn't expect only 4 intervals in both of these cases.

It wasn't until I saw this exchange that I realized that:

----
plot(c(0,1),c(0.2,0.3),xaxt="n")
par(xaxp=c(0,1,4))
axis(1)
----

does work.

Perhaps if someone can explain to me why the first two don't work, I'll be
better able to anticipate this behavior in other R functions in the
future...

Should "xaxp" be listed among the options which can't be set in
"high-level" and "mid-level" plot functions in the documentation for
"par"?

Plot and axis don't give error messages, such as the one 'plot' gives if I
try to set "ps"...


platform i586-pc-linux-gnu
arch     i586
os       linux-gnu
system   i586, linux-gnu
status
major    1
minor    5.0
year     2002
month    04
day      29
language R


confused,
--
Robert Merithew, PhD
LASSP, Clark Hall
Cornell University
Ithaca NY 14850 USA

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