you might need a call to "setOldClass"; see Section "Register or
Convert?" of the corresponding help page.
Matthias
Seth Falcon schrieb:
>The default initialization for slots of class "factor" and
>"data.frame" gives NULL. This seems odd, since those slots can't ever
>be set to NULL by the user. I would expect zero-length instances of
>factor and data.frame.
>
>Here is an example:
>
>setClass("FOO", representation(a="factor", b="data.frame", c="numeric"))
>[1] "FOO"
>
>
>>ff <- new("FOO")
>>ff
>>
>>
>An object of class "FOO"
>Slot "a":
>NULL
>
>Slot "b":
>NULL
>
>Slot "c":
>numeric(0)
>
>
>sessionInfo()
>R version 2.3.0, 2005-12-26, powerpc-apple-darwin8.3.0
>
>attached base packages:
>[1] "tools" "methods" "stats" "graphics" "grDevices" "utils"
>[7] "datasets" "base"
>
>
>Slot c is initialized as I was expecting.
>
>+ seth
>
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>https://stat.ethz.ch/mailman/listinfo/r-devel
>
>
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