The documentation in the JMP 13 Scripting Guide is not very helpful, but it does point to the Scripting Index
Subset a Data Table
Subset() creates a new data table from rows that you specify. If you specify no rows, Subset
uses the selected rows. If no rows are selected or specified, it uses all rows. If no columns are
selected or specified, it uses all columns. And if Subset has no arguments, the Subset window
appears.
dt << Subset(
Columns( columns ),
Rows( row matrix ),
Linked,
Output Table Name( "name" ),
Copy Formula( 1 or 0 ),
Sampling rate( n ),
Suppress Formula Evaluation( 1 or 0 ) );
Note: For more arguments, see the Scripting Index in the Help menu.
Jim