writeDataTableSplitByColumn {LOLA} | R Documentation |
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 )
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) |
number of splits written