How to Write a Data Table to a CSV File. The Comma-Separated Values file format is a standard format for packaging data to share among normally incompatible computer applications.

In this KS1 Maths article you'll learn how to read data tables and tally charts. We also have KS1 videos, a quiz and lots of examples.

See how to use data.table's special .SD symbol to perform calculations and other tasks by group ...