[Rd] boxplot with formula involving two-factor levels
diy at stat.oregonstate.edu
diy at stat.oregonstate.edu
Fri Apr 29 23:54:09 CEST 2016
Hi,
I noticed two seemingly equivalent call to boxplot will give different plots (in the way how the combined factor levels are arranged on the x-axis):
x = factor(rep(c("a", "b", "c"), each=2));
y = rep(factor(c("one", "two")), each=3);
r = 3;
n = r * 6;
x = rep(x, 3);
y = rep(y, 3);
z = rnorm(n);
par(mfrow=c(2,1));
## The following two seeming equivalent calls to boxplot give different results
boxplot(z~x:y);
f = x:y;
boxplot(z~f);
This is puzzling to me. Is this normal?
Thanks!
Best,
Yanming
[[alternative HTML version deleted]]
More information about the R-devel
mailing list