Ross Boylan wrote:
The paper also notes that call-by-value vs call-by-reference, which is
the root of the slot update problem, is really orthogonal to the
FOOP/COOP distinction. It's easy to imagine FOOP with
call-by-reference. R.oo uses references.
Yes, it can be found on http://www.maths.l
On 6/9/2005 3:04 PM, Ross Boylan wrote:
On Wed, 2005-06-08 at 09:13 +0200, Uwe Ligges wrote:
[extensive deletions. Discussion concerned my desire to have a function change
the value
of an object in a way that had effects outside of the function, without
returning the object.]
>>You have to t
Ross Boylan wrote:
I believe your example assumes that foo is updating the outer a by
"cheating" and directly modifying enclosing environments. (I figure it
also needs to get the name of its actual argument to do this, which
would also involve slightly dirty tricks.) This does seem to be the on
On Wed, 2005-06-08 at 09:13 +0200, Uwe Ligges wrote:
[extensive deletions. Discussion concerned my desire to have a function change
the value
of an object in a way that had effects outside of the function, without
returning the object.]
> >>You have to think about scoping rules and it
> >>wil
On Wed, 2005-06-08 at 14:15 +0200, Thomas Petzoldt wrote:
...
> Hello Ross,
>
> I see that your question was related to S4, but I just noticed a
> solution based on the R.oo package so I thought I would add a solution
> based on the proto package too. We had similar problems several times
> ago an
Ross Boylan wrote:
I defined an S4 class with a slot i. Then I wrote a regular function
that attempted to increment i.
[... details deleted ...]
What do I need to do to update slot values?
Here are some possibly relevant code fragments
setClass("CompletePathMaker",
representation(i
Ross Boylan wrote:
On Tue, 2005-06-07 at 08:36 +0200, Uwe Ligges wrote:
Ross Boylan wrote:
On Sat, Jun 04, 2005 at 07:08:56PM +0200, Martin Maechler wrote:
Ross> nextPath <- function(pm){ #pm is a CompletePathMaker
Ross>[EMAIL PROTECTED] <- [EMAIL PROTECTED](1)
Ross> [etc]
If
On Tue, 2005-06-07 at 13:49 -0700, Berton Gunter wrote:
> > Second, in my experiments I couldn't get setReplacementMethod to work:
> >
> > "bumpIndex<-" <- function(pm, value) {
> > [EMAIL PROTECTED] <- [EMAIL PROTECTED](value)
> > pm
> > }
> >
> > # I get an error without the next function d
Berton Gunter wrote:
Second, in my experiments I couldn't get setReplacementMethod to work:
"bumpIndex<-" <- function(pm, value) {
[EMAIL PROTECTED] <- [EMAIL PROTECTED](value)
pm
}
# I get an error without the next function definition
bumpIndex <- function(pm) [EMAIL PROTECTED]
setReplaceMe
> Second, in my experiments I couldn't get setReplacementMethod to work:
>
> "bumpIndex<-" <- function(pm, value) {
> [EMAIL PROTECTED] <- [EMAIL PROTECTED](value)
> pm
> }
>
> # I get an error without the next function definition
> bumpIndex <- function(pm) [EMAIL PROTECTED]
>
> setReplaceM
On Tue, 2005-06-07 at 08:36 +0200, Uwe Ligges wrote:
> Ross Boylan wrote:
>
> > On Sat, Jun 04, 2005 at 07:08:56PM +0200, Martin Maechler wrote:
> >
> >>Ross> nextPath <- function(pm){ #pm is a CompletePathMaker
> >>Ross>[EMAIL PROTECTED] <- [EMAIL PROTECTED](1)
> >>Ross> [etc]
>
On Mon, 2005-06-06 at 14:15 -0700, Berton Gunter wrote:
> I'm puzzled:
>
> > It looks as if instances of class objects are best thought of as
> > immutable once created.
> >
>
> what then is setReplaceMethod() for?
assignment operators do the whole object replacement behind the scenes,
at least
Ross Boylan wrote:
On Sat, Jun 04, 2005 at 07:08:56PM +0200, Martin Maechler wrote:
Ross> nextPath <- function(pm){ #pm is a CompletePathMaker
Ross>[EMAIL PROTECTED] <- [EMAIL PROTECTED](1)
Ross> [etc]
If your nextPath function has 'pm' as its last statement it
will return the
On Sat, Jun 04, 2005 at 07:08:56PM +0200, Martin Maechler wrote:
> Ross> nextPath <- function(pm){ #pm is a CompletePathMaker
> Ross>[EMAIL PROTECTED] <- [EMAIL PROTECTED](1)
> Ross> [etc]
>
> If your nextPath function has 'pm' as its last statement it
> will return the updated
> "Ross" == Ross Boylan <[EMAIL PROTECTED]>
> on Fri, 03 Jun 2005 17:04:08 -0700 writes:
Ross> I defined an S4 class with a slot i. Then I wrote a regular function
Ross> that attempted to increment i.
Ross> This didn't work, apparently because of the general rule that a
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