[R] warning creating an as.array method in a package

[David Winsemius]

On Nov 30, 2010, at 5:43 PM, Michael Friendly wrote:

> [Env:  R 2.11.1, Win Xp, using Eclipse/StatET]
>
> In a package I'm working on, I want to create as.matrix() and  
> as.array() methods for a particular kind of
> object (log odds ratios). These are returned in a loddsratio object  
> as the $coefficients component,
> a vector, but really reflect an underlying (R-1)x(C-1)xstrata array,  
> whose attributes are contained in other
> components.
>
> I define coef, dim and dimnames methods, and then want an as.array  
> method,
>
> ## dim methods
> dimnames.loddsratio <- function(object, ...) object$dimnames
> dim.loddsratio <- function(object, ...) object$dim
> coef.loddsratio <- function(object, log = object$log, ...)
>  if(log) object$coefficients else exp(object$coefficients)
>
> as.array.loddsratio <- function (x, log=x$log, ...)
>    drop(array(coef(x, log = log), dim = dim(x), dimnames=dimnames(x)))
>
> I believe everything is declared properly in the NAMESPACE file, e.g.,
> ...
> S3method(dim, loddsratio)
> S3method(dimnames, loddsratio)
> S3method(print, loddsratio)
> S3method(vcov, loddsratio)
> S3method(as.matrix, loddsratio)
> S3method(as.array, loddsratio)
>
>
> All my tests work correctly when run in the R console, but R CMD  
> check gives me a perplexing warning:
>
> * checking whether package 'vcdExtra' can be installed ... WARNING
> Found the following significant warnings:
>  Warning: found an S4 version of 'as.array' so it has not been  
> imported correctly
> See 'C:/eclipse/vcdExtra.Rcheck/00install.out' for details.
>
> It's just a warning, so maybe I can ignore it, but I can't figure  
> out where this might have come from.
> Has anyone seen this before?  Where might an S4 version of as.array  
> be found?

Have you looked in the ".out" file in which you were told there were  
details?

I'm guessing from this behavior on my system that it may be Matrix.

 > showMethods(as.array)
Function: as.array (package base)
x="ANY"
x="Matrix"

-- 
David Winsemius, MD
West Hartford, CT