Hi Christophe
You could also look at the 'foodweb' function in package 'mvbutils'-- and
specifically 'callers.of'. It should do just what you want, though you do have
to tell it which environments to search through.
bye
Mark
--
Mark Bravington
CSIRO Mathematical & Information Sciences
Marine Laboratory
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Christophe Rhodes wrote:
> Duncan Murdoch <murdoch.dun...@gmail.com> writes:
>
>> On 27/08/2010 7:52 AM, Christophe Rhodes wrote:
>>> Hi,
>>>
>>> Is there any way, from R code, to perform introspection as to where
>>> certain names acquired their values?
>>
>> There's the "keep.source" option to source() and the optional
>> "srcfile" argument to parse() that tell R to keep this information.
>> If you haven't changed the default
>> getOption("keep.source") from TRUE, then source will default to
>> keeping it, and you can find the original location of a function
>> definition for function f by looking in attr(body(f), "srcref"). See
>> ?srcref for the format; there aren't a lot of user-level utility
>> functions for working with this.
>
> Thanks. This is enough for my immediate purposes: supporting
> single-keystroke (M-.) jumping to source locations of functions.
>
>> For packages, the relevant option is "keep.source.pkgs" at the time
>> the package is installed.
>
> Thank you.
>
> Is there anything like a cross-referencing database within R? The
> functionality I'm looking for here is to be able to name a function,
> and come back with a list of functions (or srcrefs) where that name
> is used. (I realise that this is not in general possible; just the
> lexically-apparent cases would be enough).
>
> Cheers,
>
> Christophe
>
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