Re: [R] classes with chron slots

From: Martin Maechler <>
Date: Thu 23 Jun 2005 - 18:12:06 EST

>>>>> "Sebastian" == Sebastian Luque <>
>>>>> 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 mailing list PLEASE do read the posting guide! Received on Thu Jun 23 18:14:44 2005

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