The examples I listed before are assuming that you were adding the columns to an already existing data table. If you are creating a data table from scratch and it does not have any rows defined for it, one needs to use the
dt << add rows(100);
to create empty rows, before one can place values in the cells.
Here is a complete example
names default to here(1); dt=new table("Example"); dt << new column( "Counter using a For Loop" ); dt << add rows(100); For( i=1, i<= N Rows(dt), i++, dt:Counter using a For Loop[i] = i; );
I am not sure if I really understand what you want, but if it is a simple sequence number you can easily do that multiple ways.
First, interactively. Once you create the new column, simply go to the Col Info for the new column and click on the Missing/Empty down arrow and select "Sequence Data". I will place into the new column a number from 1 to n.
Second, you can use a formula in a new column. Just create the new column, anduse the below formula to generate a sequence number for each row.
Row()
Are either of these examples any help?
dt = current data table(); dt << new column( "RowNum", format( Row() ) ); dt << new column( "Counter using a For Loop" ); For( i=1, i<= N Rows(dt), i++, dt:Counter using a For Loop[i] = i; );
