I should probably ask this question on R-devel as it is not directly
an Rcpp question but the thread started here so ...
I'm confused about accessor functions as described in
help("setRefClass") under the argument "fields". It states
The element in the list can alternatively be an _accessor
function_, a function of one argument that returns the field
if called with no argument or sets it to the value of the
argument otherwise. Accessor functions are used internally
...
The application I have in mind is classes of objects representing the
response and auxiliary information in linear, generalized linear,
nonlinear, and generalized nonlinear models. An S4 implementation is
in the MatrixModels package but the syntax of the update methods is
awkward because they must replace slots then return the whole object,
which can be rather large. What I would like to do is have an update
method that takes a new value of the linear predictor, updates the
mean, the residuals, possibly the weights (for GLMs) and the weighted
residuals. After the update, methods for other objects can query the
values of the weighted residuals, square root of the residual weights,
square root of the X weights, etc.
I'm trying to decide if the fields that can be queried should be
declared as fields or as accessor functions.
I haven't discovered any examples that declare accessor functions in
the fields section. Can anyone point out such an example to me?
On Mon, Nov 1, 2010 at 10:44 AM, Romain Francois
<rom...@r-enthusiasts.com> wrote:
> Le 01/11/10 16:34, Douglas Bates a écrit :
>>
>> On Mon, Nov 1, 2010 at 10:26 AM, Douglas Bates<ba...@stat.wisc.edu>
>> wrote:
>>>
>>> What is a good place to start reading about using the newly installed
>>> reference classes in R to interface with Rcpp?
>>
>> To answer my own question, the "Rcpp Modules" vignette.
>
> Perhaps it will be once we update the vignette. The content dates from
> before we used reference classes.
>
> For reference classes themselves, the best place to look is
> ?ReferenceClasses
>
> As Dirk pointed out, my chicago slides or our google slides might give
> nuggets of information.
>
> I guess it also depends what specifically you want to learn about them.
> Exposing a class is essentially the same as before reference classes.
>
> Deriving a C++ class, adding R methods to a class, etc ... is a new feature
> we get for free with reference classes. This is not really Rcpp specific, so
> maybe ?ReferenceClasses gives enough hints.
>
> Romain
>
> --
> Romain Francois
> Professional R Enthusiast
> +33(0) 6 28 91 30 30
> http://romainfrancois.blog.free.fr
> |- http://bit.ly/czHPM7 : Rcpp Google tech talk on youtube
> |- http://bit.ly/9P0eF9 : Google slides
> `- http://bit.ly/cVPjPe : Chicago R Meetup slides
>
>
> _______________________________________________
> Rcpp-devel mailing list
> Rcpp-devel@lists.r-forge.r-project.org
> https://lists.r-forge.r-project.org/cgi-bin/mailman/listinfo/rcpp-devel
>
_______________________________________________
Rcpp-devel mailing list
Rcpp-devel@lists.r-forge.r-project.org
https://lists.r-forge.r-project.org/cgi-bin/mailman/listinfo/rcpp-devel
