[R] classes with chron slots
I'd like to define a class with a chron slot, but:
R> require(chron)
R> setClass("myclass", representation(datetime = "chron"))
[1] "myclass"
Warning message:
undefined slot classes in definition of "myclass": datetime(class "chron")
in: .completeClassSlots(ClassDef, where)
How should such a class be defined?
Sebastian
--
Sebastian P. Luque
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Re: [R] classes with chron slots
> "Sebastian" == Sebastian Luque <[EMAIL PROTECTED]>
> on Wed, 22 Jun 2005 15:50:50 -0500 writes:
Sebastian> I'd like to define a class with a chron slot, but:
R> require(chron)
R> setClass("myclass", representation(datetime = "chron"))
Sebastian> [1] "myclass"
Sebastian> Warning message:
Sebastian> undefined slot classes in definition of "myclass":
datetime(class "chron")
Sebastian> in: .completeClassSlots(ClassDef, where)
Sebastian> How should such a class be defined?
You need to first make "chron" into a (pseudo-) S4 class,
using setOldClass()
Then you can extend it or use it as slot class.
Martin Maechler, ETH Zurich
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Re: [R] classes with chron slots
On 6/23/05, Martin Maechler <[EMAIL PROTECTED]> wrote:
> > "Sebastian" == Sebastian Luque <[EMAIL PROTECTED]>
> > on Wed, 22 Jun 2005 15:50:50 -0500 writes:
>
>Sebastian> I'd like to define a class with a chron slot, but:
>R> require(chron)
>R> setClass("myclass", representation(datetime = "chron"))
>Sebastian> [1] "myclass"
>Sebastian> Warning message:
>Sebastian> undefined slot classes in definition of "myclass":
> datetime(class "chron")
>Sebastian> in: .completeClassSlots(ClassDef, where)
>
>Sebastian> How should such a class be defined?
>
> You need to first make "chron" into a (pseudo-) S4 class,
> using setOldClass()
>
> Then you can extend it or use it as slot class.
>
Also if you are referring to the chron package then
the names of the chron classes are 'dates' and 'times' -- not 'chron'.
R> library(chron)
R> example(chron)
...snip...
R> class(dts)
[1] "dates" "times"
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Re: [R] classes with chron slots
On 6/23/05, Martin Maechler <[EMAIL PROTECTED]> wrote:
> > "Sebastian" == Sebastian Luque <[EMAIL PROTECTED]>
> > on Wed, 22 Jun 2005 15:50:50 -0500 writes:
>
>Sebastian> I'd like to define a class with a chron slot, but:
>R> require(chron)
>R> setClass("myclass", representation(datetime = "chron"))
>Sebastian> [1] "myclass"
>Sebastian> Warning message:
>Sebastian> undefined slot classes in definition of "myclass":
> datetime(class "chron")
>Sebastian> in: .completeClassSlots(ClassDef, where)
>
>Sebastian> How should such a class be defined?
>
> You need to first make "chron" into a (pseudo-) S4 class,
> using setOldClass()
>
> Then you can extend it or use it as slot class.
>
Also if you are referring to the chron package then
the names of the chron classes are 'dates' and 'times' -- not 'chron'.
R> library(chron)
R> example(chron)
...snip...
R> class(dts)
[1] "dates" "times"
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Re: [R] classes with chron slots
Thanks a lot Martin and Gabor! On Thu, 23 Jun 2005 08:20:44 -0400, Gabor Grothendieck <[EMAIL PROTECTED]> wrote: [...] > Also if you are referring to the chron package then > the names of the chron classes are 'dates' and 'times' -- not 'chron'. However, when the object has both dates and times, then the class becomes 'chron', inheriting both 'dates' and 'times': R> class(x) [1] "chron" "dates" "times" in the same example. Cheers, Sebastian -- Sebastian P. Luque __ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
Re: [R] classes with chron slots
On 6/23/05, Sebastian Luque <[EMAIL PROTECTED]> wrote: > Thanks a lot Martin and Gabor! > > > On Thu, 23 Jun 2005 08:20:44 -0400, > Gabor Grothendieck <[EMAIL PROTECTED]> wrote: > > [...] > > > Also if you are referring to the chron package then > > the names of the chron classes are 'dates' and 'times' -- not 'chron'. > > However, when the object has both dates and times, then the class becomes > 'chron', inheriting both 'dates' and 'times': > > R> class(x) > [1] "chron" "dates" "times" Did you try the example I posted? Its self contained and reproducible and it inherits from both "dates" and "times" yet there is no "chron" in the class vector, at least in that case. __ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
Re: [R] classes with chron slots
On 6/23/05, Gabor Grothendieck <[EMAIL PROTECTED]> wrote: > On 6/23/05, Sebastian Luque <[EMAIL PROTECTED]> wrote: > > Thanks a lot Martin and Gabor! > > > > > > On Thu, 23 Jun 2005 08:20:44 -0400, > > Gabor Grothendieck <[EMAIL PROTECTED]> wrote: > > > > [...] > > > > > Also if you are referring to the chron package then > > > the names of the chron classes are 'dates' and 'times' -- not 'chron'. > > > > However, when the object has both dates and times, then the class becomes > > 'chron', inheriting both 'dates' and 'times': > > > > R> class(x) > > [1] "chron" "dates" "times" > > > Did you try the example I posted? Its self contained and reproducible and > it inherits from both "dates" and "times" yet there is no "chron" in the class > vector, at least in that case. > Just to be clear, the point is that you need to be sure that your chron objects really have class "chron" since one often speaks of chron objects that are of class dates or times but not chron. This may or may not be a problem for you but I thought it worthwhile pointing out just in case. __ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
Re: [R] classes with chron slots
On Thu, 23 Jun 2005 10:13:31 -0400, Gabor Grothendieck <[EMAIL PROTECTED]> wrote: [...] > Just to be clear, the point is that you need to be sure that your chron > objects really have class "chron" since one often speaks of chron > objects that are of class dates or times but not chron. That's right, I was just pointing out that there *is* a 'chron' class, which is an extension of both 'dates' and 'times', as shown by object 'x' in the examples we were talking about. Cheers, -- Sebastian P. Luque __ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
