[datatable-help] Assignment by reference fails silently

[Arunkumar Srinivasan]

Thanks for reporting. I've added this case under comments to another
recently filed issue bug
#5442<https://r-forge.r-project.org/tracker/index.php?func=detail&aid=5442&group_id=240&atid=975>from
Michele (as I am quite sure they're related to handling column types
in `:=` without grouping).

Arun.


On Fri, Apr 25, 2014 at 7:25 PM, John Laing <john.laing at gmail.com> wrote:

> If I create a logical column in my data.table and try to
> assign-by-reference a character value to it, the assignment fails silently.
> That is, it doesn't work but doesn't throw an error:
>
> ## make a simple data.table
> require(data.table)
> dt <- data.table(a=1:3, b=4:6, c=NA)
>
> ## fails silently
> dt[, c := "foo"]
> dt
>
> In other cases where an action would lead to the implicit conversion of a
> column, data.table throws an error suggesting that the user convert the
> column explicitly if that's what they really mean to do. I think that's the
> right behavior and should be adopted in this case as well.
>
> -John
>
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