Hi
is there an alternative to par(new), for ading data to a plot for a
different y-axis?
My problem with par(new=TRUE) is, that it re-defines all axis and labels (as
in example 1) and one has to use xlim=... to fix the x-axis.
I am looking for something, which simply resets the y-axis, so that a new
plot() (or points()/lines()) keeps the x-axis, but re-defines the y-axis.
Is there something available? I could re-scale the y-data to fit the
existing y-axis, but that would mean to define all the labels and tickmarks
for axis 4 manually.
HEre is an example about what I mean:
x1 <- 1:10
y1 <- runif(10)
x2 <- 1:11
y2 <- c(y1*100, 0)
## (1) Does not plot points where (x-axis) they should be
plot(x1, y1, type="l")
par(new=TRUE)
plot(x2, y2, type="p")
axis(4)
## (2) Does plot points where (x-axis) they should be
xlim <- range(x1)
plot(x1, y1, type="l", xlim=xlim)
par(new=TRUE)
plot(x2, y2, type="p", xlim=xlim)
axis(4)
Cheers,
Rainer
--
Rainer M. Krug, PhD (Conservation Ecology, SUN), MSc (Conservation Biology,
UCT), Dipl. Phys. (Germany)
Centre of Excellence for Invasion Biology
Natural Sciences Building
Office Suite 2039
Stellenbosch University
Main Campus, Merriman Avenue
Stellenbosch
South Africa
Cell: +27 - (0)83 9479 042
Fax: +27 - (0)86 516 2782
Fax: +49 - (0)721 151 334 888
email: rai...@krugs.de
Skype: RMkrug
Google: r.m.k...@gmail.com
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