On Jan 28, 2011, at 12:35 PM, Marc Carpentier wrote:
Right. Shame on me : Friday's tiredness ; I don't know why I stuck
on that.
Please just consider the main topic of my message, regarding the
example of
ReferenceClasses (supposing it's appropriate) and sorry for the
subsequent
question...
I'm definitely the wrong one to tackle any S4 or ReferenceClasses
questions. There have been some discussion on r-devel about how to
pick up the ReferenceClasses methods but they flew right over my
greying head. The latest incarnation of Baron's RSiteSearch allows
searching the r-devel archives:
http://search.r-project.org/cgi-bin/namazu.cgi?query=ReferenceClasses&max=100&result=normal&sort=score&idxname=functions&idxname=Rhelp10&idxname=R-devel
And maybe other search strings could be even more productive, since I
only tried one. I would have thought the ReferenceC;asses part of your
question to be more appropriate for r-devel anyway.
--
David.
----- Message d'origine ----
De : David Winsemius <dwinsem...@comcast.net>
À : Marc Carpentier <marc.carpent...@ymail.com>
Cc : r-help@r-project.org
Envoyé le : Ven 28 janvier 2011, 17h 39min 59s
Objet : Re: [R] ReferenceClasses examples {method}
On Jan 28, 2011, at 11:05 AM, Marc Carpentier wrote:
Dear help, dear John Chambers,
I'm trying to learn OOP-possibilities in R and I was going through
the
documentation 'ReferenceClasses {methods}'. (great work, by the
way...)
Reading associated Examples, something bothers me : it seems to me
that there
are errors in 'edit' and 'undo' methods. I think that :
- 'undo' should update 'edits' field with :
length(edits) <<- length(edits) - 1 #(and not - 2)
- and for coherence, 'edit' should store modifications in an
'append'-style :
edits <<- c(edits,list(backup)) #as opposed to c(list(backup),edits)
I hope I'm not wrong.
As a complementary question, suppose one kept
'c(edits,list(backup))', does
anyone know how todiscard first element(s) of a list? For a vector :
vedits<<-vedits[-1]
But lists can't be selected that way ( edits<<- edits [[-1]] #wrong )
You are confusing "[" and "[["
ll <- list(a=1,b=2,cc=3)
ll[-1]
$b
[1] 2
$cc
[1] 3
--
David Winsemius, MD
West Hartford, CT
David Winsemius, MD
West Hartford, CT
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