Removed unused variable 'mode' because R CMD check complained.
Removed unused variable 'mode' because R CMD check complained.

Rdatatable/data.table,Rdatatable/data.table,vlulla/data.table,vlulla/data.table,Rdatatable/data.table,Rdatatable/data.table,vlulla/data.table,jangorecki/data.table,vlulla/data.table,jangorecki/data.table,jangorecki/data.table,jangorecki/data.table