r data.table multiple column assignment

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1. Add Row & Column to data.table in R (4 Examples)

   

2. Add Row & Column to data.table in R (4 Examples)

   

3. Group data.table by Multiple Columns in R (Example)

   

4. Group data.table by Multiple Columns in R (Example)

   

5. R Remove Multiple Columns from data.table (Example)

   

6. Apply Function to data.table in Each Specified Column in R (Example)