[datatable-help] whole data.table copied "warning"

[Arunkumar Srinivasan]

The part "by taking a copy" should be "by taking a shallow copy". Other
than that, nothing is wrong. If you get this message, then your data.table
has somehow lost it's over-allocation.

I can't help much without seeing a minimal reproducible example :-(.

On Tue, Jan 27, 2015 at 3:53 PM, statquant3 <statquant at outlook.com> wrote:

> Arun, this is what I get...
> I still think something is wrong no ?
>
> Warning message:
> In `[.data.table`(DT, , `:=`(KEY, paste0(date, symbol, sep = "_"))) :
>   Invalid .internal.selfref detected and fixed by taking a copy of the
> whole
> table so that := can add this new column by reference. At an earlier point,
> this data.table has been copied by R (or been created manually using
> structure() or similar). Avoid key<-, names<- and attr<- which in R
> currently (and oddly) may copy the whole data.table. Use set* syntax
> instead
> to avoid copying: ?set, ?setnames and ?setattr. Also, in R<=v3.0.2,
> list(DT1,DT2) copied the entire DT1 and DT2 (R's list() used to copy named
> objects); please upgrade to R>v3.0.2 if that is biting. If this message
> doesn't help, please report to datatable-help so the root cause can be
> fixed.
>
>
>
>
> --
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