> version
_
platform x86_64-w64-mingw32
arch x86_64
os mingw32
system x86_64, mingw32
status Patched
major 3
minor 4.3
year 2017
month 12
day 12
svn rev 73903
language R
version.string R version 3.4.3 Patched (2017-12-12 r73903)
nickname Kite-Eating Tree
> tt <- xyplot(y ~ x | a*b, data=data.frame(x=1:6, y=7:12, a=c(1:3,1:3),
> b=c(1,1,1,2,2,2)))
> tt
> t(tt)
> t(t(tt))
Error in update.trellis(x, perm.cond = rev(x$perm.cond)) :
Invalid value of 'perm.cond'
>
compare to numeric matrix
> tmp <- cbind(1:3, 4:6)
> tmp
[,1] [,2]
[1,] 1 4
[2,] 2 5
[3,] 3 6
> t(tmp)
[,1] [,2] [,3]
[1,] 1 2 3
[2,] 4 5 6
> t(t(tmp))
[,1] [,2]
[1,] 1 4
[2,] 2 5
[3,] 3 6
>
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