[R] how to override/replace a function in a package namespace?

[Henrik Bengtsson]

The few times I want to patch a function like this, I use:

  unlockBinding(name, env);
  assignInNamespace(name, value, ns=pkgName, envir=env);
  assign(name, value, envir=env);
  lockBinding(name, env);

/Henrik

On Sun, Aug 17, 2008 at 10:50 AM, Gabor Grothendieck
<ggrothendieck at gmail.com> wrote:
> In that case add this:
>
> unlockBinding("strucplot", as.environment("package:vcd"))
> assign("strucplot", my.strucplot, "package:vcd")
>
>
>
> On Sun, Aug 17, 2008 at 1:22 PM, Ben Bolker <bolker at ufl.edu> wrote:
>> Gabor Grothendieck <ggrothendieck <at> gmail.com> writes:
>>
>>>
>>> Check out:
>>>
>>> ?assignInNamespace
>>>
>>> On Sun, Aug 17, 2008 at 12:42 PM, Michael Friendly wrote:
>>> > I'm trying to test an extension of mosaic() from the vcd package that
>>> > requires a change to the
>>> > basic strucplot() function from that package.  I want to test my change by
>>> > sourcing the
>>> > replacement function into my R session.
>>> >
>>
>>  Yes, but:
>>
>> from the note in ?assignInNamespace
>>
>> assignInNamespace and fixInNamespace change the copy in the namespace,
>>  but not any copies already exported from the namespace, in particular
>> an object of that name in the package (if already attached) and any
>> copies already imported into
>> other namespaces. They are really intended to be used only
>> for objects which are
>> not exported from the namespace. They do attempt to alter
>> a copy registered as
>> an S3 method if one is found.
>>
>>  So if strucplot is exported from the vcd namespace (which I guess
>> it is), this won't work.
>>
>>  When I ran into a similar situation recently I couldn't find any
>> solution other than rebuilding the package with my changes.
>>
>>  Ben Bolker
>>
>> ______________________________________________
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>> PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
>> and provide commented, minimal, self-contained, reproducible code.
>>
>
> ______________________________________________
> R-help at r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
>