All,
Now in v1.8.1 on R-Forge. Please shout if this causes any problems.
o New DT[.(...)] syntax (in the style of package plyr) is identical to
DT[list(...)], DT[J(...)] and DT[data.table(...)]. The J() alias
has been removed from data.table's namespace, but still works inside
DT[...], as in DT[J(...)]. J() was conflicting with function J() in
package XLConnect (#1747) and rJava (#2045). For data.table to change
was easier, with some efficiency advantages too.
If you have used J() independently (i.e. outside DT[...]) then you
may see
'Error: could not find function "J"'
and if so merely type
J = data.table
at the prompt and your code should work (albeit by reintroducing the
conflict with XLConnect and rJava) until you can replace your calls
to J() with list() or data.table(). This should work if any packages
you use have themselves used J() outside of DT[...], too.
Aside: we plan to add ..(), so that .() and ..() are analogous to
the file system's ./ and ../; i.e., .() evaluates within the frame
of DT, ..() in the parent scope.
Matthew
_______________________________________________
datatable-help mailing list
[email protected]
https://lists.r-forge.r-project.org/cgi-bin/mailman/listinfo/datatable-help
