This looks like a bug in latticeExtra: in the c.trellis function there
are these lines:
## some prepanel functions require a 'subscripts' argument in each
'panel.args'
if ("subscripts" %in% c(names(formals(obj1$prepanel.default)),
names(formals(obj1$prepane
> library(latticeExtra)
Loading required package: lattice
Loading required package: RColorBrewer
> t11 <- xyplot(1 ~ 1)
> t11
> c(t11, t11)
Warning message:
In formals(fun) : argument is not a function
> version
_
platform x86_64-w64-mingw32
arch x86_64
os
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