Displaying 20 results from an estimated 1000 matches similar to: "Reference Classes/S4 Classes: can method dispatch check superclasses BEFORE resorting to method for "ANY"?"
2010 Nov 17
2
Reference classes: accessor functions via 'getRefClass(...)$accessors(...)'
Hi there,
I''d like to choose between an "static" and "dynamic" access of a reference
class field, say ''a''.
myObj <- getRefClass("Blabla")$new()
Static: myObj$a
Dynamic: myObj$a.get() where the function retrieves the data
from a database (or some other location), stores it to a buffer and
2011 Jun 29
1
Ref Classes: bug with using '.self' within initialize methods?
Dear list,
I'm wondering if the following error I'm getting is a small bug in the
Reference Class paradigm or if it makes perfect sense.
When you write an explicit initialize method for a Ref Class, can you
then make use of '.self' WITHIN this initialize method just as you would
once an object of the class has actually been initialized?
Because it seems to me that you can not.
2010 Nov 23
1
Reference Classes: removing methods -> implications for objects/instances of that class
Dear list,
just to make sure that I understand 'unregistering' methods for S4 reference
classes correctly:
If I registered a method and want to 'unregister' (i.e. remove) this method
again, objects/instance created of the respective class still feature the
removed method until I do an explicit reassign ('my.instance <-
getRefClass("Classname")$new()'), right?
2011 Jun 01
1
possibly invalid assertion in setRefClass?
> setRefClass("Foo", fields = list())
Error in setRefClass("Foo", fields = list()) :
A list argument for fields must have nonempty names for all the fields
In my opinion, the above should not fail. There are no fields.
Thanks,
Michael
[[alternative HTML version deleted]]
2011 Jun 06
1
How can I write methods for 'as()'?
Dear list,
I wonder how to write methods for the function 'as' in the sense that I
can call 'as(object, Class, strict=TRUE, ext)' and let method dispatch
figure out the correct method.
AFAIU, there is a difference between, e.g. 'as.data.frame' and the
methods of 'as()' as stated above since the former depends on arg 'x'
instead of 'object',
2011 Oct 31
1
Question about copying reference objects using the initialize method
Dears,
I have a question about copying reference objects using the initialize method.
1) If the latter has no arguments, there is no problem to copy an object.
myClass = setRefClass("myClass", fields = list(value = "numeric") )
myClass$methods(initialize = function(...){
? value <<- 1
? callSuper(...)
})
newObject = myClass$new()
newObject$value = 2
copyObject =
2011 Jun 06
1
Reference Classes: shortcut like 'isS4' for Ref Classes?
Dear list,
is there a shortcut-function to check whether a class is a Reference
Class or not? There's something like this for S4 classes
('isS4(object)'), but I couldn't find anything regarding Ref Classes.
Currently, I'm doing it this way, which is a bit clumsy:
A <- setRefClass("A", fields=list(X="numeric"))
a <- A$new()
isRefClass <-
2011 Mar 07
1
WG: Reference classes: error with missing arguments in method calls
Dear list,
a while ago I posted this at r-devel but got no answers. Hope it?s okay to
give it a shot again by cross-posting it here.
TIA for any comments,
Janko
Von: Janko Thyson [mailto:janko.thyson.rstuff at googlemail.com]
Gesendet: Montag, 21. Februar 2011 00:58
An: r-devel at r-project. org (r-devel at r-project.org)
Betreff: Reference classes: error with missing arguments in method calls
2011 May 26
0
Reference Classes: getter and setter functions/methods and possible shortcuts
Hi everyone,
just wanted to ask what's the smartest/recommended way of defining
getter and setter function *shortcuts* (i.e. something like "[", "[<-")
for Reference Class objects?
Or is it desired to not use this stuff, but define methods like
'obj$getSubset(row=1:3, col=1)' and 'obj$setSubset(value=x)' instead?
I have some example code that might
2010 Nov 21
1
reference classes: question on inheritance
Dear list,
I have a reference class which should act as a "generic" superclass for
other classes. I've read the respective section at ?setRefClass and put the
name of the superclass to the 'contains' argument of an example subclass
(see class defs below). Classnames are set in a way that shouldn't result in
collation issues (virtual def sourced before superclass def
2010 Nov 24
2
Reference Classes: how to clone/copy instances?
Dear list,
I don't know what's the correct term for this in the OOP context, but is it
possible to "clone"/copy an instance of a reference class (say 'a') so that
I get an *autonomous* second instance 'b'? Autonomous in the sense that
changes to 'a' do not affect 'b'.
I know that this is somewhat against the pass-by-reference paradigm, but the
2011 Jun 03
2
Bug or feature: using "ANY" as a generic field class (was: '[R] Is there a (virtual) class that all R objects inherit from?)
Dear list,
I was wondering if you could help me out in clarifying something:
Is it possible to use class "ANY" in slots/fields of formal classes if you
a) do not want to restrict valid classes of that field and
b) if you are making explicit use of class inheritance?
It seems to work in simple scenarios but produces errors when class
inheritance comes into play. So I was
2011 May 04
1
Reference Classes: replacing '.self' with an .Rda image of '.self' from within a method? (was replacing '.self' with an .Rda image of '.self' from within a method?)
Sorry guys,
but I chose a really stupid name before (no "reference classes").
Hope it's okay to re-post.
Cheers,
Janko
>>> ORIGINAL MESSAGE <<<
Dear list,
Is it possible to update or reassign '.self' with an image of '.self'
(e.g. a locally stored .Rda file) from within a method?
I know that this might sound akward, but here's the use
2011 Aug 30
1
Why does loading saved/cached objects add significantly to RAM consumption?
Dear list,
I make use of cached objects extensively for time consuming computations
and yesterday I happened to notice some very strange behavior in that
respect:
When I execute a given computation whose result I'd like to cache (tried
both saving it as '.Rdata' and via package 'R.cache' which uses a own
filetype '.Rcache'), my R session consumes about 200 MB of
2011 Feb 03
2
Creating a reference class object from a class definition in a package fails
Hi,
I'm trying to create a package that contains reference class
definitions from which users can create reference objects, but there
seems to be something awry.
My toy example creates an empty package via
package.skeleton('TestClass') to which I add the following R code:
TestClass <- setRefClass('TestClass',fields=c('name'))
Unfortunately my R console output
2011 Dec 07
1
Possible bug in 'new()' for Reference Classes
Dear list,
I think I stumbled across a little bug with respect to the standard
initialization routine for Reference Classes.
It seems that a field 'self' is treated as if it's name would be '.self'
(which we know is reserved for the self reference of the instantiated
object itself) and thus an error is thrown.
If the field value is assigned in an explicit call after the
2009 Dec 08
1
problem with split eating giga-bytes of memory
I'm having trouble using split on a very large data-set with ~1400 levels of
the factor to be split. Unfortunately, I can't reproduce it with the simple
self-contained example below. As you can see, splitting the artificial
dataframe of size ~13MB results in a split dataframe of ~ 144MB, with an
increase memory allocation of ~10 fold for the split object. If split scales
linearly, then my
2011 Sep 24
1
Can't reliably use RefClass methods in Snowfall
Greetings,
I am trying to use Reference Class methods in Snowfall, using R 2.12.1
on Ubuntu Natty. Using then directly seems to work (stanza 2 below),
but using them indirectly does not (stanza 3 below). I get an "attempt
to apply non-function" error.
In addition to exporting the instance of the object I created to the
Snowfall slaves, I also made several attempts to export the
2011 Apr 07
3
Correlation Matrix
Listers,
I have a question regarding correlation matrices. It is fairly straight
forward to build a correlation matrix of an entire data frame. I simply use
the command cor(MyDataFrame). However, what I would like to do is construct
a smaller correlation matrix using just three of the variable out of my data
set.
When I run this:
cor(MyDataFrame$variable1,
2010 Mar 11
2
Can't convert list to matrix properly
Hi guys, here is a list of names that I have:
MyList:
> myList<-list("A", "B","C","D")
> myList
[[1]]
[1] "A"
[[2]]
[1] "B"
[[3]]
[1] "C"
[[4]]
[1] "D"
I want to turn this list into a matrix of 1 row and 4 columns with those
four components (A, B, C, D) so here is what I do:
myDataFrame <-