[datatable-help] Gremlins since 1.7.8

[Matthew Dowle]

There's quite a lot going on here and I'm not sure where to start. Just a
first stab ...

Other ways to get this message are using colnames<- and dimnames<-, both
of which should be replaced with calls to setnames() [now in 1.7.9]. 
Could that be it?  Perhaps grep all your R source for "[)][ ]*[<][-]" and
"[)][ ]*[=]" and see if anything I didn't anticipate pops up?  You're
looking for anything that copies via `*tmp*` i.e. somefun()<-value

I think I got loading and saving from disk right, even loading pre-1.7.8
data.table, but things have been moving fast and I'm not that surprised
there could be a gremlin there. When you say 'resaved it' at the end, do
you mean resaving it and then reloading it, and in the same R session or a
new one.  And is this all in 2.14.0, both pre and post 1.7.8?

Chris has convinced me off list that it should be an error but it should
shallow copy and be a warning. So that'll be changed for next release, but
it'll still warn with the same message.

So R-Forge is back up then. Anyone know if it was down for improvement
(e.g. binary builds and checks working now?), or ...

Matthew

> All,
>
> My colleagues and I have been working hard to root out old code since
> 1.7.8 but every now and then for reasons I can't discern I get errors
> like:
>
>
> Error in `[.data.table`(x, , `:=`(i, .xi), with = FALSE) :
>
>   At an earlier point, this data.table has been copied by R. Avoid key<-,
> names<- and attr<- which in R currently (and oddly) all copy the whole
> data.table. Use set* syntax instead to avoid copying:
>
> setkey(), setnames() and setattr(). If this message doesn't help, please
> ask on datatable-help.
>
>
> If I have data.table objects created with an earlier version of
> data.table, do they function exactly the same with the updated version of
> data.table. Or do they need to be re-data.tabled?
>
> Strangely, the above error disappeared when we did some cleaning on the
> data.set and resaved it?
>
> Puzzled,
>
> Damian Betebenner
> Center for Assessment
> PO Box 351
> Dover, NH   03821-0351
>
> Phone (office): (603) 516-7900
> Phone (cell): (857) 234-2474
> Fax: (603) 516-7910
>
> dbetebenner at nciea.org<mailto:dbetebenner at nciea.org>
> www.nciea.org<http://www.nciea.org/>
>
>
>
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