[Rd] as.list method for by Objects

Michael Lawrence lawrence.michael at gene.com
Tue Jan 30 19:37:38 CET 2018

I agree that it would make sense for the object to have c("by", "list") as
its class attribute, since the object is known to behave as a list.
However, it would may be too disruptive to make this change at this point.
Hard to predict.


On Mon, Jan 29, 2018 at 5:00 PM, Dario Strbenac <dstr7320 at uni.sydney.edu.au>

> Good day,
> I'd like to suggest the addition of an as.list method for a by object that
> actually returns a list of class "list". This would make it safer to do
> type-checking, because is.list also returns TRUE for a data.frame variable
> and using class(result) == "list" is an alternative that only returns TRUE
> for lists. It's also confusing initially that
> > class(x)
> [1] "by"
> > is.list(x)
> [1] TRUE
> since there's no explicit class definition for "by" and no mention if it
> has any superclasses.
> --------------------------------------
> Dario Strbenac
> University of Sydney
> Camperdown NSW 2050
> Australia
> ______________________________________________
> R-devel at r-project.org mailing list
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