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On 30 Jan 2004 at 12:58, Francisco J Molina wrote: > > Is there a function like "is.there" such that > > is.there ( a ) returns TRUE is object 'a' is in the current > environment and FALSE otherwise? Have you tried exists...
On 24 Feb 2004 at 21:38, Uwe Ligges wrote: > > setClass("myclass", representation("ANY", x = "numeric", y > > ="numeric")) > > > > new("myclass", 1:10) # works > > new("myclass", "Test") # works > > new("myclass", factor(1:10)) # fails > > Why do you think it fails? I...
On 28 May 2004 at 8:19, Duncan Murdoch wrote: > I'd advise against doing this kind of optimization. It will make your > code harder to maintain, and while it might be faster today, if "@<-" > is really a major time...
I'm using R 1.8.1 (Win32, Linux) and have some difficulties using validation functions for S4 classes. The problem is if I specify a validation function with setValidity("myclass", validate.myclass) object validation is only performed when I...
On 27 May 2004 at 19:12, Wolski wrote: > But this document is quite intersting. Which document are you refering to ? > I have just two R questions which arised reading the document which a > core members of the R-project...
I'm trying to create a formal class that does the following: 1) accept objects of arbitrary class as .Data slot 2) provide a set of other slots that are of fixed type (as usual) The following two approaches came...
On 25 Feb 2004 at 10:00, Uwe Ligges wrote: > So you are going to handle/mix the S4 class like/with S3 classes? Hmm. Yes, and there is the problem. With S4 classes, it works. Now I would expect...
On 30 Jan 2004 at 14:05, John Chambers wrote: > It was never the intention that validity checking happen automatically > on _every_ assignment of an object from the class--since those > assignments take place frequently during evaluation of functions, the...
Hello Oscar, I reply in English because that's the language used on this list. > Die Verwendung der beiden Programme Labview und R ist unpraktisch. Es > stellt sich daher die Frage, ob serielle Daten auch ??ber R eingelesen > werden k...
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