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$prepanel.default)),
names(formals(obj1$prepanel)))) {
But obj1$prepanel is NULL in your test case. NULL is not a legal
argument to formals(), and it now warns about it.
Duncan Murdoch
On 14/12/2017 1:12 AM, Richard M. Heiberger wrote:>> 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 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
>>
>
>
> the c.trellis seems to work correctly except for the new warning.
>
> There was no warning in 3.3.3.
> I first noticed it in 3.4.1
>
> the c.trellis function itself is not changed between 3.3.3 and 3.4.3
Patched.
>
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