[Rd] simplify2array assumes non-NA dim() -- base or method bug?

[Dirk Eddelbuettel]

Also NROW() and NCOL() exist for situations where two dimensions are assumed
or preferred and dim() needs a little help:

> NROW(table(letters))
[1] 26
> NCOL(table(letters))
[1] 1
>

Dirk

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