How to release memory in loop script

[#1]

I created a loop script for a very big dataset. When looping, for all the temporary data table, I use close(dt, No Save), seems it can release the memory. However, in one of the data table, I keep adding a temporary column, did some post process, then delete that column. After I finish running the loop, 5G of my HDD is gone. Is there any way I can release the memory after I delete the temporary column? Thank you.

[#2 · Accepted solution]

I doubt this is possible as it would break the Undo functionality to undo deleting a column.
A workaround would be to save the data table in the loop after deleting temp column, close the table, and then reopen it to create the next temp column.  This would cause JMP to release the memory every time the table is closed.

[#3]

Never thought of that. Thank you for the suggestion! 

[#4]

What if you use a matrix instead of a temporary column?  I think you can release memory simply by setting the matrix variable = .

[#5]

Good point. You could also use the same column instead of deleting it, particularly if it was a character column. Just clear the contents by assigning a '.' or a "" for numeric or character respectively.

[#6]

When JMP detects that there is not enough memory to store the information for Undo it asks the user if it's OK to preceed without the possibility to trigger UNDO.

Can this "no UNDO" mode be turned on via JSL?