r - ggvis and data.table conflict? -


i trying run ggvis in combination data.table, see code below. following error:

error in `:=`(mpg2, mpg/2) :    check is.data.table(dt) == true. otherwise, := , `:=`(...)    defined use     in j, once , in particular ways. see help(":=").

if run line mtcars[ , mpg2 := mpg / 2] in console there no problem. problem? [i still suspicious fact both data.table , ggvis use :=. 

--- title: "untitled" output: html_document runtime: shiny ---  ```{r echo = false} library(ggvis) library(data.table)  mtcars %>%   ggvis(x = ~wt, y = ~mpg) %>%   layer_points()  mtcars = data.table(mtcars) mtcars[, mpg2 := mpg / 2]  # gives error message  # code below not work line above throws error  mtcars %>%   ggvis(x = ~wt, y = ~mpg2) %>%   layer_points()

```

data.table version 1.9.2

ggvis github 0.3.0.9001 cran version complained missing knit_print.

i have updated data.table 1.9.3 , works should now. thanks!


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