Re: [R] classes with chron slots

From: Martin Maechler <maechler_at_stat.math.ethz.ch>
Date: Thu 23 Jun 2005 - 18:12:06 EST

>>>>> "Sebastian" == Sebastian Luque <spluque@gmail.com>
>>>>> 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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