[Rd] length-0 list as dimnames

[Benilton Carvalho]

Thank you very much for pointing me to the correct part of the
documentation (and apologies for that), Simon. Very much appreciated,
b

On 6 June 2012 00:43, Simon Urbanek <simon.urbanek at r-project.org> wrote:
>
> On Jun 5, 2012, at 7:37 PM, Benilton Carvalho wrote:
>
>> Hi,
>>
>> I'm working on a package and observed a behaviour that was suggested
>> to be incompatible with the documentation.
>>
>> The code below:
>>
>> x <- matrix(1:4, 2)
>> dimnames(x) <- list()
>>
>> works just fine. But checking the documentation for dimnames(), it
>> states that if value is a list "its components are either 'NULL' or a
>> character vector with positive length of the appropriate dimension of
>> x".
>>
>> Should dimnames() return an error on the example above?
>>
>
> No, from the docs:
>
>     The replacement method for arrays/matrices coerces vector and
>     factor elements of ‘value’ to character, but does not dispatch
>     methods for ‘as.character’.  It coerces zero-length elements to
>     ‘NULL’, and a zero-length list to ‘NULL’.
>
> you are using a 0-length list, so it is coerced to NULL.
>
> Cheers,
> Simon
>
>
>
>> Thank you very much for your attention and time,
>>
>> benilton
>>
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>>
>>
>