[R] .Internal(filledcontour()) - ancient history or just plain wrong?

[Prof Brian Ripley]

On 14/06/2014 10:30, Raphael Päbst wrote:
> You are right, it was
>    there is no .Internal function 'filledcontour'
>
>
> and changing it to .filled.contour() removed the problem.
>
> Just out of curiosity, would the old version with
> .Internal(filledcontour()) have worked on older R-Versions?

Possibly.  Note that the internals of that undocumented .Internal did 
change over the years.

>
> Not that I fully understand how .Internal() works and should (or
> should not) be used, but I'm always willing to understand more about
> the code I'm working with.
>
> Thanks again!
>
> Raphael
>
> On 6/14/14, Prof Brian Ripley <ripley at stats.ox.ac.uk> wrote:
>> On 14/06/2014 10:04, Raphael Päbst wrote:
>>> Hello everyone!
>>> In my ongoing odyssey through badly dokumented and sparingly commented
>>> R-code, I've come across something that baffles me.
>>> The following line of code
>>>
>>> .Internal(filledcontour(as.double(x), as.double(y), z,
>>> as.double(levels), col = col))
>>>    not surprisingly results in an error, telling me that there is no
>>> such function as filledcontour().
>>
>> But that passes a call to .Internal: it does not say what you say it
>> does.  I suspect you saw
>>
>>     there is no .Internal function 'filledcontour'
>>
>> which is quite a different matter.
>>
>>> The code this comes from has been written for an older version of R,
>>> probably 2.5.x so I was wondering, if the error results from me using
>>> a current version (3.1.0) or if the author wanted to use
>>> filled.contour() and forgot the '.'.
>>>
>>> Would that in fact help or was there something called filledcontour()
>>> that has changed into something else nowadays?
>>
>> It has.  But it was never in the API, so should never have been used in
>> user code and was never documented in R itself.
>>
>> You should be able to rewrite this using .filled.contour in package
>> graphics: it might be a drop-in replacement.
>>
>>>
>>> I've tried to contact the author, but he hasn't used R for at least
>>> five years and hasn't replied so far, so I'm hoping soeone here can
>>> give me a hint to the solution of this problem.
>>>
>>> Many thanks in advance!
>>>
>>> Raphael
>>
>>
>>
>> --
>> Brian D. Ripley,                  ripley at stats.ox.ac.uk
>> Professor of Applied Statistics,  http://www.stats.ox.ac.uk/~ripley/
>> University of Oxford,             Tel:  +44 1865 272861 (self)
>> 1 South Parks Road,                     +44 1865 272866 (PA)
>> Oxford OX1 3TG, UK                Fax:  +44 1865 272595
>>
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-- 
Brian D. Ripley,                  ripley at stats.ox.ac.uk
Professor of Applied Statistics,  http://www.stats.ox.ac.uk/~ripley/
University of Oxford,             Tel:  +44 1865 272861 (self)
1 South Parks Road,                     +44 1865 272866 (PA)
Oxford OX1 3TG, UK                Fax:  +44 1865 272595