Given a data table and a factor variable to split on, efficiently divides the table and then writes the different splits to separate files, named with filePrepend and numbered according to split.

Given a data table and a factor variable to split on, efficiently divides the table and then writes the different splits to separate files, named with filePrepend and numbered according to split.

writeDataTableSplitByColumn(DT, splitFactor, filePrepend = "",
  orderColumn = NULL)

Arguments

DT	data.table to split
splitFactor	column of DT to split on
filePrepend	notation string to prepend to output files
orderColumn	column of DT to order on (defaults to the first column)

Value

number of splits written