Ok I see that. Please raise a bug report for this one. Thanks.
On Sun, 2011-12-04 at 05:07 -0600, Damian Betebenner wrote:
> All,
>
>
>
> Finding some inconsistent behaviors in how data.table deals with
> variable assignment depending upon whether a $ or [[ ]] is used.
>
> I’m using data.table 1.7.4
>
>
>
>
>
>
>
> require(data.table)
>
>
>
> ### Using $
>
>
>
> tmp.dt <- data.table(X=1:5)
>
> tmp.dt$Y <- factor(1, levels=1:2, labels=c(“VALID_CASE”,
> “INVALID_CASE”))
>
>
>
> > tmp.dt
>
> X Y
>
> [1,] 1 1
>
> [2,] 2 1
>
> [3,] 3 1
>
> [4,] 4 1
>
> [5,] 5 1
>
>
>
> > sapply(tmp.dt, class)
>
> X Y
>
> "integer" "integer"
>
>
>
> ### Using [[
>
>
>
> tmp.dt <- data.table(X=1:5)
>
> tmp.dt[[“Y”]] <- factor(1, levels=1:2, labels=c(“VALID_CASE”,
> “INVALID_CASE”))
>
>
>
> > tmp.dt
>
> X Y
>
> [1,] 1 VALID_CASE
>
> [2,] 2 VALID_CASE
>
> [3,] 3 VALID_CASE
>
> [4,] 4 VALID_CASE
>
> [5,] 5 VALID_CASE
>
> > sapply(tmp.dt, class)
>
> X Y
>
> "integer" "factor"
>
>
>
>
>
> Thoughts,
>
>
>
> Damian
>
>
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>
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