> While I run the command
> R crashes. This behavior occurs in both R Studio and R GUI, regardless of
> the version (2.14, 2.15, 3.0). Is it really a bug or am I doing something
If by "crash" you mean that the program actually terminates (i.e.
not just an error), then this is by definition a bug in data.table --
there is a bug tracker at
https://r-forge.r-project.org/tracker/?group_id=240 , or you
could try contacting the package maintainer (help(package="data.table")